Fix location summary for LoadClass

Don't request a register for the current method if we're gonna call the
runtime.

Change-Id: I9760d15108bd95efb2a34e6eacd84b60841781d7
diff --git a/compiler/optimizing/code_generator_x86_64.cc b/compiler/optimizing/code_generator_x86_64.cc
index ad6588c..272d86f 100644
--- a/compiler/optimizing/code_generator_x86_64.cc
+++ b/compiler/optimizing/code_generator_x86_64.cc
@@ -4703,15 +4703,18 @@
 
 void InstructionCodeGeneratorX86_64::VisitLoadClass(HLoadClass* cls) {
   LocationSummary* locations = cls->GetLocations();
-  CpuRegister out = locations->Out().AsRegister<CpuRegister>();
-  CpuRegister current_method = locations->InAt(0).AsRegister<CpuRegister>();
   if (cls->NeedsAccessCheck()) {
     codegen_->MoveConstant(locations->GetTemp(0), cls->GetTypeIndex());
     codegen_->InvokeRuntime(QUICK_ENTRY_POINT(pInitializeTypeAndVerifyAccess),
                             cls,
                             cls->GetDexPc(),
                             nullptr);
-  } else if (cls->IsReferrersClass()) {
+    return;
+  }
+
+  CpuRegister out = locations->Out().AsRegister<CpuRegister>();
+  CpuRegister current_method = locations->InAt(0).AsRegister<CpuRegister>();
+  if (cls->IsReferrersClass()) {
     DCHECK(!cls->CanCallRuntime());
     DCHECK(!cls->MustGenerateClinitCheck());
     __ movl(out, Address(current_method, ArtMethod::DeclaringClassOffset().Int32Value()));