[PATCH] Stop resetting DisableTailCalls in TargetMachine::resetTargetOptions

[Akira Hatanaka]

Added a function that doesn't have any attributes and a test case for x86_64.


http://reviews.llvm.org/D10099

Files:
  include/llvm/CodeGen/CommandFlags.h
  include/llvm/Target/TargetOptions.h
  lib/Target/ARM/ARMISelLowering.cpp
  lib/Target/Hexagon/HexagonISelLowering.cpp
  lib/Target/TargetMachine.cpp
  lib/Target/X86/X86ISelLowering.cpp
  lib/Transforms/IPO/PassManagerBuilder.cpp
  lib/Transforms/Scalar/TailRecursionElimination.cpp
  test/CodeGen/ARM/disable-tail-calls.ll
  test/CodeGen/X86/disable-tail-calls.ll

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