[Atomics] code stubs for atomic operations

src/crankshaft/ia32/lithium-codegen-ia32.cc

Index: src/crankshaft/ia32/lithium-codegen-ia32.cc
diff --git a/src/crankshaft/ia32/lithium-codegen-ia32.cc b/src/crankshaft/ia32/lithium-codegen-ia32.cc
index c5d6534eddbae4e31ab20f5bd39649128b1689cb..57ca0eed72dcabed893195fe473698164cd3c52e 100644
--- a/src/crankshaft/ia32/lithium-codegen-ia32.cc
+++ b/src/crankshaft/ia32/lithium-codegen-ia32.cc
@@ -997,6 +997,16 @@ void LCodeGen::DoCallStub(LCallStub* instr) {
       CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
       break;
     }
+    case CodeStub::AtomicsLoad: {

[Jarin, 2016/01/28 08:11:12]

You should not need this if you used HCallWithDesriptor.

[binji, 2016/01/28 16:20:01]

Done.

+      // TODO(binji): better way to do this?
+      AtomicsLoadDescriptor descriptor(isolate());
+      DCHECK(descriptor.GetRegisterParameterCount() == 2);
+      __ Pop(descriptor.GetRegisterParameter(1));
+      __ Pop(descriptor.GetRegisterParameter(0));
+      AtomicsLoadStub stub(isolate());
+      CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
+      break;
+    }
     default:
       UNREACHABLE();
   }