[PATCH] Disable x86 tail call optimization under PIC mode

[David]

================
Comment at: lib/Target/X86/X86ISelLowering.cpp:2929
@@ -2928,3 @@
-    } else {
-      // If we are tail calling and generating PIC/GOT style code load the
-      // address of the callee into ECX. The value in ecx is used as target of
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It is a valid optimization with eager binding, so it seems the behavior should be controlled by an option.

http://reviews.llvm.org/D9799

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