finally get around to doing a significant cleanup to irgen:

finally get around to doing a significant cleanup to irgen:
have CGF create and make accessible standard int32,int64 and
intptr types.  This fixes a ton of 80 column violations
introduced by LLVMContextification and cleans up stuff a lot.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@106977 91177308-0d34-0410-b5e6-96231b3b80d8