X87: [Ignition] Teach CompileLazy about interpreted functions.

  port 72c37076(r42034)

  original commit message:
  Currently the CompileLazy builtin checks the SFI expliciltly for FCG code. This means
  if the SFI has bytecode we have to go through to the runtime to install the
  interpreter entry trampoline into the JSFunction object.

  Modify the builtin to always put the SFI code object into the JSFunction unless it's
  the lazy compile stub on the SFI as well.

BUG=

Review-Url: https://codereview.chromium.org/2614533003
Cr-Commit-Position: refs/heads/master@{#42081}

src/builtins/x87/builtins-x87.cc

@@ -1123,14 +1123,14 @@ void Builtins::Generate_CompileLazy(MacroAssembler* masm) {
   __ test_b(FieldOperand(entry, SharedFunctionInfo::kMarkedForTierUpByteOffset),
             Immediate(1 << SharedFunctionInfo::kMarkedForTierUpBitWithinByte));
   __ j(not_zero, &gotta_call_runtime_no_stack);
-  // Is the full code valid?
+
+  // If SFI points to anything other than CompileLazy, install that.
   __ mov(entry, FieldOperand(entry, SharedFunctionInfo::kCodeOffset));
-  __ mov(ebx, FieldOperand(entry, Code::kFlagsOffset));
-  __ and_(ebx, Code::KindField::kMask);
-  __ shr(ebx, Code::KindField::kShift);
-  __ cmp(ebx, Immediate(Code::BUILTIN));
+  __ Move(ebx, masm->CodeObject());
+  __ cmp(entry, ebx);
   __ j(equal, &gotta_call_runtime_no_stack);
-  // Yes, install the full code.
+
+  // Install the SFI's code entry.
   __ lea(entry, FieldOperand(entry, Code::kHeaderSize));
   __ mov(FieldOperand(closure, JSFunction::kCodeEntryOffset), entry);
   __ RecordWriteCodeEntryField(closure, entry, ebx);