[Ignition] Teach CompileLazy about interpreted functions.

src/builtins/x64/builtins-x64.cc

 // Copyright 2012 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.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/code-factory.h"
 #include "src/codegen.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 1058 matching lines @@
 
   // We found neither literals nor code.
   __ jmp(&gotta_call_runtime);
 
   __ bind(&try_shared);
   __ movp(entry, FieldOperand(closure, JSFunction::kSharedFunctionInfoOffset));
   // Is the shared function marked for tier up?
   __ testb(FieldOperand(entry, SharedFunctionInfo::kMarkedForTierUpByteOffset),
            Immediate(1 << SharedFunctionInfo::kMarkedForTierUpBitWithinByte));
   __ j(not_zero, &gotta_call_runtime);
-  // Is the full code valid?
+
+  // If SFI points to anything other than CompileLazy, install that.
   __ movp(entry, FieldOperand(entry, SharedFunctionInfo::kCodeOffset));
-  __ movl(rbx, FieldOperand(entry, Code::kFlagsOffset));
-  __ andl(rbx, Immediate(Code::KindField::kMask));
-  __ shrl(rbx, Immediate(Code::KindField::kShift));
-  __ cmpl(rbx, Immediate(Code::BUILTIN));
+  __ Move(rbx, masm->CodeObject());
+  __ cmpp(entry, rbx);
   __ j(equal, &gotta_call_runtime);
-  // Yes, install the full code.
+
+  // Install the SFI's code entry.
   __ leap(entry, FieldOperand(entry, Code::kHeaderSize));
   __ movp(FieldOperand(closure, JSFunction::kCodeEntryOffset), entry);
   __ RecordWriteCodeEntryField(closure, entry, r15);
   __ jmp(entry);
 
   __ bind(&gotta_call_runtime);
   GenerateTailCallToReturnedCode(masm, Runtime::kCompileLazy);
 }
 
 void Builtins::Generate_CompileBaseline(MacroAssembler* masm) {
@@ skipping 1949 matching lines @@
 void Builtins::Generate_InterpreterOnStackReplacement(MacroAssembler* masm) {
   Generate_OnStackReplacementHelper(masm, true);
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64