Revert "Don't block quick callee saved registers for optimizing."

X64 has one libcore test failing, and codegen_test on
arm is failing.

This reverts commit 6004796d6c630696127df2494dcd4f30d1367a34.

Change-Id: I20e00431fa18e11ce4c0cb6fffa91977fa8e9b4f
diff --git a/compiler/optimizing/code_generator_arm64.h b/compiler/optimizing/code_generator_arm64.h
index 38e2965..1d5bfb7 100644
--- a/compiler/optimizing/code_generator_arm64.h
+++ b/compiler/optimizing/code_generator_arm64.h
@@ -48,6 +48,9 @@
 const vixl::CPURegList vixl_reserved_core_registers(vixl::ip0, vixl::ip1);
 const vixl::CPURegList vixl_reserved_fp_registers(vixl::d31);
 const vixl::CPURegList runtime_reserved_core_registers(tr, vixl::lr);
+const vixl::CPURegList quick_callee_saved_registers(vixl::CPURegister::kRegister,
+                                                    vixl::kXRegSize,
+                                                    kArm64CalleeSaveRefSpills);
 
 Location ARM64ReturnLocation(Primitive::Type return_type);