Speculatively disable x86 portion of r120501 to appease the x86_64 buildbot.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120549 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index bc6d84e..2bff139 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -1339,6 +1339,8 @@
 }
 
 bool X86TargetLowering::isUsedByReturnOnly(SDNode *N) const {
+  // Temporarily disabled.
+  return false;
   if (N->getNumValues() != 1)
     return false;
   if (!N->hasNUsesOfValue(1, 0))