[Atomics] code stubs for atomic operations

src/crankshaft/x64/lithium-codegen-x64.cc

Index: src/crankshaft/x64/lithium-codegen-x64.cc
diff --git a/src/crankshaft/x64/lithium-codegen-x64.cc b/src/crankshaft/x64/lithium-codegen-x64.cc
index 695c19777bd47ee1673d62f8ef7c0f315bcac34b..95b42d83bd1d9bfdc94e0068426d37bc70a0b14f 100644
--- a/src/crankshaft/x64/lithium-codegen-x64.cc
+++ b/src/crankshaft/x64/lithium-codegen-x64.cc
@@ -927,6 +927,16 @@ 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();
   }