Evan Cheng d4b0873c06 Enable sibling call optimization of libcalls which are expanded during ...

legalization time. Since at legalization time there is no mapping from
SDNode back to the corresponding LLVM instruction and the return
SDNode is target specific, this requires a target hook to check for
eligibility. Only x86 and ARM support this form of sibcall optimization
right now.
rdar://8707777

llvm-svn: 120501

2010-11-30 23:55:39 +00:00

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