Disable stack coloring with register for now. It's not able to set kill markers.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78179 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/LLVMTargetMachine.cpp b/lib/CodeGen/LLVMTargetMachine.cpp
index 6f0581a..8249501 100644
--- a/lib/CodeGen/LLVMTargetMachine.cpp
+++ b/lib/CodeGen/LLVMTargetMachine.cpp
@@ -281,7 +281,9 @@
 
   // Perform stack slot coloring.
   if (OptLevel != CodeGenOpt::None)
-    PM.add(createStackSlotColoringPass(OptLevel >= CodeGenOpt::Aggressive));
+    // FIXME: Re-enable coloring with register when it's capable of adding
+    // kill markers.
+    PM.add(createStackSlotColoringPass(false));
 
   printAndVerify(PM);           // Print the register-allocated code