R600: Fix trunc i64 to i32 on SI

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192375 91177308-0d34-0410-b5e6-96231b3b80d8
Add comments to debug info testing case.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192376 91177308-0d34-0410-b5e6-96231b3b80d8
Debug Info: In DIBuilder, the context field of subprogram is updated to use
DIScopeRef.

A paired commit at clang is required due to changes to DIBuilder.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192378 91177308-0d34-0410-b5e6-96231b3b80d8
Fix grammar / missing words

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192380 91177308-0d34-0410-b5e6-96231b3b80d8