Temporarily revert r71010. It was causing massive failures during self-hosting.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71138 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/LLVMTargetMachine.cpp b/lib/CodeGen/LLVMTargetMachine.cpp
index 5f19660..faaa41b 100644
--- a/lib/CodeGen/LLVMTargetMachine.cpp
+++ b/lib/CodeGen/LLVMTargetMachine.cpp
@@ -193,7 +193,7 @@
 
   // Perform stack slot coloring.
   if (OptLevel != CodeGenOpt::None)
-    PM.add(createStackSlotColoringPass(OptLevel >= CodeGenOpt::Aggressive));
+    PM.add(createStackSlotColoringPass());
 
   if (PrintMachineCode)  // Print the register-allocated code
     PM.add(createMachineFunctionPrinterPass(cerr));