[wasm] remove faux code objects

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

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/code-generator.h"
 
 #include "src/ast/scopes.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 641 matching lines @@
 // Assembles an instruction after register allocation, producing machine code.
 CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
     Instruction* instr) {
   X64OperandConverter i(this, instr);
   InstructionCode opcode = instr->opcode();
   ArchOpcode arch_opcode = ArchOpcodeField::decode(opcode);
   switch (arch_opcode) {
     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));
         __ call(reg);
       }
       RecordCallPosition(instr);
       frame_access_state()->ClearSPDelta();
       break;
     }
     case kArchTailCallCodeObjectFromJSFunction:
@@ skipping 1642 matching lines @@
     int padding_size = last_lazy_deopt_pc_ + space_needed - current_pc;
     __ Nop(padding_size);
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8