Clean up a large number of C++11 attribute parse issues, including parsing
attributes in more places where we didn't and catching a lot more issues.

This implements nearly every aspect of C++11 attribute parsing, except for:
 - Attributes are permitted on explicit instantiations inside the declarator
   (but not preceding the decl-spec)
 - Attributes are permitted on friend declarations of functions.
 - Multiple instances of the same attribute in an attribute-list (e.g.
   [[noreturn, noreturn]], not [[noreturn]] [[noreturn]] which is conforming)
   are allowed.
The first two are marked as expected-FIXME in the test file and the latter
is probably a defect and is currently untested.

Thanks to Richard Smith for providing the lion's share of the testcases.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@159072 91177308-0d34-0410-b5e6-96231b3b80d8
Support the tls_model attribute (PR9788)

This adds support for the tls_model attribute. This allows the user to
choose a TLS model that is better than what LLVM would select by
default. For example, a variable might be declared as:

  __thread int x __attribute__((tls_model("initial-exec")));

if it will not be used in a shared library that is dlopen'ed.

This depends on LLVM r159077.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@159078 91177308-0d34-0410-b5e6-96231b3b80d8
Add triple to test/Sema/attr-tls_model.c

Not all targets support __thread variables.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@159080 91177308-0d34-0410-b5e6-96231b3b80d8
objective-c: issue deprecation/unavailability warnings for methods called on 
id <Protocol>. // rdar://11618852


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@159084 91177308-0d34-0410-b5e6-96231b3b80d8
Recognize GNU attributes after 'enum class'.  Fixes the libc++ build.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@159089 91177308-0d34-0410-b5e6-96231b3b80d8
IRGen: Factor v-table generation into the CGCXXABI object.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@159091 91177308-0d34-0410-b5e6-96231b3b80d8
[diagtool] Add a new "tree" command to shows warnings activated by a flag.

% diagtool tree -Wunused-value
-Wunused-value
  -Wunused-comparison
    warn_unused_comparison
  -Wunused-result
    warn_unused_result
  warn_unused_call
  warn_unused_container_subscript_expr
  warn_unused_expr
  warn_unused_property_expr
  warn_unused_voidptr

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@159093 91177308-0d34-0410-b5e6-96231b3b80d8
[diagtool] Appease buildbots by explicitly using makeArrayRef.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@159095 91177308-0d34-0410-b5e6-96231b3b80d8
Add testing for CommentHandler, and fix a bug where trailing comments in #else
and #endif in non-skipped blocks were not passed to the CommentHandler. Patch
by Andy Gibbs!


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@159119 91177308-0d34-0410-b5e6-96231b3b80d8
Add test for -Wused-but-marked-unused on private fields.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@159130 91177308-0d34-0410-b5e6-96231b3b80d8
Make explicit specializations at class scope work
for non-type template parameters in microsoft mode.
PR12709.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@159147 91177308-0d34-0410-b5e6-96231b3b80d8
Appease -Wnon-virtual-dtor and fix a typo in a comment

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@159151 91177308-0d34-0410-b5e6-96231b3b80d8
Thread safety analysis:  implement lock_returned attribute.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@159152 91177308-0d34-0410-b5e6-96231b3b80d8
Unrevert r158887, reverted in r158949, along with a fix for the bug which
resulted in it being reverted. A test for that bug was added in r158950.

Original comment:

If an object (such as a std::string) with an appropriate c_str() member function
is passed to a variadic function in a position where a format string indicates
that c_str()'s return type is desired, provide a note suggesting that the user
may have intended to call the c_str() member.

Factor the non-POD-vararg checking out of DefaultVariadicArgumentPromotion and
move it to SemaChecking in order to facilitate this. Factor the call checking
out of function call checking and block call checking, and extend it to cover
constructor calls too.

Patch by Sam Panzer!


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@159159 91177308-0d34-0410-b5e6-96231b3b80d8
[analyzer] Be careful about implicitly-declared operator new/delete. (PR13090)

The implicit global allocation functions do not have valid source locations,
but we still want to treat them as being "system header" functions for the
purposes of how they affect program state.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@159160 91177308-0d34-0410-b5e6-96231b3b80d8
Use std::map instead of llvm::DenseMap because we rely on the stability of references to values in these maps. PR13197.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@159161 91177308-0d34-0410-b5e6-96231b3b80d8
Extend the "expected ';' after struct" logic to also apply to enums, and to
struct and enum forward-declarations.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@159164 91177308-0d34-0410-b5e6-96231b3b80d8
PR12937: Explicitly deleting an explicit template specialization.

This works around a quirk in the way that explicit template specializations are
handled in Clang. We generate an implicit declaration from the original
template which the explicit specialization is considered to redeclare. This
trips up the explicit delete logic.

This change only works around that strange representation. At some point it'd
be nice to remove those extra declarations to make the AST more accurately
reflect the C++ semantics.

Review by Doug Gregor.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@159167 91177308-0d34-0410-b5e6-96231b3b80d8
ARM: enable struct byval for APCS.

Revert r136662 which disables ARM byval.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@159168 91177308-0d34-0410-b5e6-96231b3b80d8
Add tests that I wrote for r159060 but forgot to `svn add`.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@159170 91177308-0d34-0410-b5e6-96231b3b80d8