* Teach DAG combiner about X86ISD::SETCC by adding a TargetLowering hook.

llvm-svn: 24921

bytes to pop off stack.
* Added support for X86 SETCC.

llvm-svn: 24917

  for Darwin.
* Added lowering hook for ISD::RET. It inserts CopyToRegs for the return
  value (or store / fld / copy to ST(0) for floating point value). This
  eliminate the need to write C++ code to handle RET with variable number
  of operands.

llvm-svn: 24888

llvm-svn: 24877

llvm-svn: 24870

llvm-svn: 24754

llvm-svn: 24430

contributed by Evan Cheng.

llvm-svn: 24358