[PATCH] Attach readonly and readnone attributes to inline-asm instructions

[Akira Hatanaka]

Made changes to the previous patch to stop attaching readonly or readnone in the following cases:

1. The inline-asm has no output operands. In this case, it is implicitly volatile.
2. The inline-asm returns a value by-reference instead of by-value. The previous patch wasn't catching the case where a "=r" constraint resulted in a value being returned by-reference.

Also, fixed the test case to catch those two cases.


http://reviews.llvm.org/D10546

Files:
  lib/CodeGen/CGStmt.cpp
  test/CodeGen/asm-attrs.c

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