[wasm] remove faux code objects

src/compiler/x64/code-generator-x64.cc

Index: src/compiler/x64/code-generator-x64.cc
diff --git a/src/compiler/x64/code-generator-x64.cc b/src/compiler/x64/code-generator-x64.cc
index a4ece5d557ac0a21887a363a5d63c942c615a331..6167d1a1dd02573c56e55ef026c663dfa36d5cef 100644
--- a/src/compiler/x64/code-generator-x64.cc
+++ b/src/compiler/x64/code-generator-x64.cc
@@ -659,8 +659,13 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
     case kArchCallCodeObject: {
       EnsureSpaceForLazyDeopt();
       if (HasImmediateInput(instr, 0)) {
-        Handle<Code> code = Handle<Code>::cast(i.InputHeapObject(0));
-        __ Call(code, RelocInfo::CODE_TARGET);
+        Constant callee_operand = i.ToConstant(instr->InputAt(0));
+        if (callee_operand.type() == Constant::Type::kInt32) {
+          __ wasm_direct_call(callee_operand.ToInt32());
+        } else {
+          Handle<Code> code = Handle<Code>::cast(i.InputHeapObject(0));
+          __ Call(code, RelocInfo::CODE_TARGET);
+        }
       } else {
         Register reg = i.InputRegister(0);
         __ addp(reg, Immediate(Code::kHeaderSize - kHeapObjectTag));