[PATCH] ARM: fix application of de morgan's law

[Saleem Abdulrasool]

Hi t.p.northover,

! (EnableARMTailCalls && Subtarget->supportsTailCall()) <=>
    !EnableARMTailCalls || !Subtarget->supportsTailCall()

This would inadvertently enable tail calls when they should not be.

Signed-off-by: Saleem Abdulrasool <compnerd at compnerd.org>

http://llvm-reviews.chandlerc.com/D1069

Files:
  lib/Target/ARM/ARMISelLowering.cpp

Index: lib/Target/ARM/ARMISelLowering.cpp
===================================================================
--- lib/Target/ARM/ARMISelLowering.cpp
+++ lib/Target/ARM/ARMISelLowering.cpp
@@ -1375,7 +1375,7 @@
   bool isThisReturn   = false;
   bool isSibCall      = false;
   // Disable tail calls if they're not supported.
-  if (!EnableARMTailCalls && !Subtarget->supportsTailCall())
+  if (!EnableARMTailCalls || !Subtarget->supportsTailCall())
     isTailCall = false;
   if (isTailCall) {
     // Check if it's really possible to do a tail call.
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