CodeGen: Fix a typo in getThreadLocalWrapperLinkage

The description had a misspelling.  No functionality change.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@211908 91177308-0d34-0410-b5e6-96231b3b80d8
clang-cl: Map /EHs- to -fno-exceptions

This isn't 100% compatible with MSVC, but it's close enough.  MSVC's /EH
flag doesn't really control exceptions so much as how to clean up after
an exception is thrown.  The upshot is that cl.exe /EHs- will compile
try, throw, and catch statements with a warning, but clang-cl will
reject such constructs with a hard error.  We can't compile such EH
constructs anyway, but this may matter to consumers of the AST.

Reviewers: hans

Differential Revision: http://reviews.llvm.org/D4317

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@211909 91177308-0d34-0410-b5e6-96231b3b80d8
Add reparse test for libclang

Adapted from a reproducer by Dan Schmidt, thanks!

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@211910 91177308-0d34-0410-b5e6-96231b3b80d8
Remove 'const' from MemoryBuffers used through the SourceManager

This removes a const_cast added in r211884 that occurred due to an
inconsistency in how MemoryBuffers are handled between some parts of
clang and LLVM.

MemoryBuffers are immutable and the general convention in the LLVM
project is to omit const from immutable types as it's simply
redundant/verbose (see llvm::Type, for example). While this change
doesn't remove "const" from /every/ MemoryBuffer, it at least makes this
chain of ownership/usage consistent.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@211915 91177308-0d34-0410-b5e6-96231b3b80d8