[PATCH] D13978: [X86] Support MCU psABI when marking inregs

[Michael Kuperstein via cfe-commits]

mkuper created this revision.
mkuper added reviewers: rnk, rafael.
mkuper added a subscriber: cfe-commits.
mkuper added a dependency: D13977: [X86] Add elfiamcu triple support, and a workaround for PR3997.
Herald added a subscriber: aemerson.

The  MCU psABI has a calling convention that is somewhat, but not quite, like -mregparm 3.
This adds support for this calling convention.

It depends on D13977 which introduces MCU triple support.

http://reviews.llvm.org/D13978

Files:
  lib/CodeGen/TargetInfo.cpp
  test/CodeGen/x86_32-arguments-iamcu.c

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