[PATCH] [ARM] Use function attribute "arm-long-calls"

[Akira Hatanaka]

Hi echristo, dexonsmith,

This patch makes changes in ARMTargetLowering::LowerCall to check the caller function for the existence of function attribute "arm-long-calls" and use it to decide if it should emit a long call. Inliner conservatively rejects inlining if the caller has "arm-long-calls" but the callee doesn't, or vice-versa.

http://reviews.llvm.org/D9364

Files:
  lib/Analysis/IPA/InlineCost.cpp
  lib/Target/ARM/ARMISelLowering.cpp
  test/CodeGen/ARM/fn-attr-long-calls.ll
  test/Transforms/Inline/attributes.ll

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