[PATCH] Disable x86 tail call optimization under PIC mode

[Chih-Hung Hsieh]

Okay, I removed the change to isMustTailCall in the new diff.


http://reviews.llvm.org/D9799

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/pic.ll
  test/CodeGen/X86/tail-call-got.ll
  test/CodeGen/X86/tailcallpic1.ll
  test/CodeGen/X86/tailcallpic2.ll

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