Re-apply r222646 (was reverted in r222667). Adding 4 ASTMatchers: typedefDecl, isInMainFile, isInSystemFile, isInFileMatchingName

Change to original: ifndef out tests in Windows due to /-separated
paths.

Summary:
Often one is only interested in matches within the main-file or matches
that are not within a system-header, for which this patch adds
isInMainFile and isInSystemFile. They take no arguments and narrow down
the matches.

The isInFileMatchingName is mainly thought for interactive
clang-query-sessions, to make a matcher more specific without restarting
the session with the files you are interested in for that moment. It
takes a string that will be used as regular-expression to match the
filename of where the matched node is expanded.

Patch by Hendrik von Prince.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@222765 91177308-0d34-0410-b5e6-96231b3b80d8
Try to fix a ppc64 bot.  What is this 'signext' stuff anyway?
No wonder most people use specific triples.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@222769 91177308-0d34-0410-b5e6-96231b3b80d8
Ensure that any TypoExprs in the arguments to bultins with custom type
checking are handled before the custom type checking is performed.

Fixes PR21669.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@222797 91177308-0d34-0410-b5e6-96231b3b80d8
CodeGen: Fix emission of __atomic_compare_exchange

We (wrongly) discarded the return value of the call.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@222798 91177308-0d34-0410-b5e6-96231b3b80d8
[c++1z] Most of N4268 (allow constant evaluation for non-type template arguments).

We don't yet support pointer-to-member template arguments that have undergone
pointer-to-member conversions, mostly because we don't have a mangling for them yet.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@222807 91177308-0d34-0410-b5e6-96231b3b80d8
clang-format: [Java] Support Foo.class;

Before:
  SomeClass.
  class.getName();

After:
  SomeClass.class.getName();

This fixes llvm.org/PR21665.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@222813 91177308-0d34-0410-b5e6-96231b3b80d8
Merge branch 'master', remote-tracking branch 'trunk/master'