Add new ABIArgInfo kind: Extend. This allows target to implement its own argument
zero/sign extension logic (consider, e.g. target has only 64 bit registers and thus
i32's should be extended as well).

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@72998 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed