[PATCH] Disable x86 tail call optimization under PIC mode

[Reid Kleckner]

================
Comment at: lib/Target/X86/X86ISelLowering.cpp:2759
@@ +2758,3 @@
+  if (Subtarget->isPICStyleGOT())
+    isTailCall = IsMustTail = false;
+
----------------
We can't do this, musttail guarantees that a tail call will occur. I think the old behavior of forcing relocations to be resolved eagerly was preferable. If we cannot honor musttail, we must report an error somehow.

http://reviews.llvm.org/D9799

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