Wrap a comment to 80 columns, no code change.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@213288 91177308-0d34-0410-b5e6-96231b3b80d8
Provide __SIG_ATOMIC_MAX__ next to __SIG_ATOMIC_WIDTH__.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@213289 91177308-0d34-0410-b5e6-96231b3b80d8
[UBSan] Add !nosanitize metadata to the code generated by UBSan.

This is used to mark the instructions emitted by Clang to implement
variety of UBSan checks. Generally, we don't want to instrument these
instructions with another sanitizers (like ASan).

Reviewed in http://reviews.llvm.org/D4544


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@213291 91177308-0d34-0410-b5e6-96231b3b80d8