[Driver] Refactor clang driver to use LLVM's Option library

The big changes are:
- Deleting Driver/(Arg|Opt)*
- Rewriting includes to llvm/Option/ and re-sorting
- 'using namespace llvm::opt' in clang::driver
- Fixing the autoconf build by adding option everywhere

As discussed in the review, this change includes using directives in
header files.  I'll make follow up changes to remove those in favor of
name specifiers.

Reviewers: espindola

Differential Revision: http://llvm-reviews.chandlerc.com/D975

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@183989 91177308-0d34-0410-b5e6-96231b3b80d8
Suppress the c++11 -Wdeprecated warning for 'register' if it is expanded from a
macro defined in a system header. glibc uses it in macros, apparently.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@184005 91177308-0d34-0410-b5e6-96231b3b80d8
Unify return type checking for functions and ObjC methods.  Move all the
random checks for ObjC object return types to SemaType.cpp.

Fixes issue with ObjC method type checking reported on cfe-dev.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@184006 91177308-0d34-0410-b5e6-96231b3b80d8
Fix comments referring to non-existent types.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@184007 91177308-0d34-0410-b5e6-96231b3b80d8
Fix handling of const_cast from prvalue to rvalue reference: such a cast is
only permitted if the source object is of class type, and should materialize a
temporary for the reference to bind to.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@184017 91177308-0d34-0410-b5e6-96231b3b80d8
PR16263: Implement current direction of core issue 1376. Binding a reference to
the result of a cast-to-reference-type lifetime-extends the object to which the
reference inside the cast binds.

This requires us to look for subobject adjustments on both the inside and the
outside of the MaterializeTemporaryExpr when looking for a temporary to
lifetime-extend (which we also need for core issue 616, and possibly 1213).


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@184024 91177308-0d34-0410-b5e6-96231b3b80d8
Emit native implementations of atomic operations on FreeBSD/armv6.

Just like on Linux, FreeBSD/armv6 assumes the system supports
ldrex/strex unconditionally. It is also used by the kernel. We can
therefore enable support for it, like we do on Linux.

While there, change one of the unit tests to explicitly test against
armv5 instead of armv7, as it actually tests whether libcalls are
emitted.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@184040 91177308-0d34-0410-b5e6-96231b3b80d8
A quick fix to allow return type deduction on member templates
by ensuring DiagnoseUseOfDecl is called both on the found decl and the
decl being used (i.e the specialization in the case of member templates) whenever they are different.
Per the exchange captured in
http://lists.cs.uiuc.edu/pipermail/cfe-commits/Week-of-Mon-20130610/081636.html
a more comprehensive fix that allows both decls to be passed into DiagnoseUseOfDecl is (or should be) forthcoming relatively soon.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@184043 91177308-0d34-0410-b5e6-96231b3b80d8
Updated the support for contextual conversion tweaks (n3323) with a previously overlooked part: implicitly converting array sizes to size_t, rather than contextually converting them to some unique type.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@184048 91177308-0d34-0410-b5e6-96231b3b80d8
Updated status of support for contextual conversion from partial to full

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@184049 91177308-0d34-0410-b5e6-96231b3b80d8
ArrayRef'ize Sema::CodeComplete*

Patch by Robert Wilhelm.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@184052 91177308-0d34-0410-b5e6-96231b3b80d8
Fixed one buildbot-failure-causing bug...

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@184053 91177308-0d34-0410-b5e6-96231b3b80d8
PR16339: Don't produce a diagnostic pointing at the whitespace between a '#if'
and a '!defined(X)' if we find a broken header guard. This is suboptimal; we
should point the diagnostic at the 'X' token not the 'if' token, but it fixes
the crash.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@184054 91177308-0d34-0410-b5e6-96231b3b80d8
Add testcase for DR39 from PR5916.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@184056 91177308-0d34-0410-b5e6-96231b3b80d8
Add tests for C++ DR100-150.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@184057 91177308-0d34-0410-b5e6-96231b3b80d8
Merge remote-tracking branch 'upstream/master'