Converted Block-ABI-Apple.txt => Block-ABI-Apple.rst.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@171799 91177308-0d34-0410-b5e6-96231b3b80d8
Simplify computing debug info type for static member functions.

No (intended) functional change.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@171800 91177308-0d34-0410-b5e6-96231b3b80d8
[ubsan] Use correct type for compound assignment ops.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@171801 91177308-0d34-0410-b5e6-96231b3b80d8