Modular Codegen: Include testing for inline asm as well as some commentary on...

Modular Codegen: Include testing for inline asm as well as some commentary on the implementaiton choice.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@300106 91177308-0d34-0410-b5e6-96231b3b80d8