[ia32,root] Port ContinueToBuiltin variants

Bug: v8:6666
Change-Id: I54ee5bcaef729d1a4b9edbae3157951df135df90
Reviewed-on: https://chromium-review.googlesource.com/1238239
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56147}

src/builtins/ia32/builtins-ia32.cc

@@ -1354,7 +1354,13 @@ namespace {
 void Generate_ContinueToBuiltinHelper(MacroAssembler* masm,
                                       bool java_script_builtin,
                                       bool with_result) {
+#ifdef V8_EMBEDDED_BUILTINS
+  // TODO(v8:6666): Fold into Default config once root is fully supported.
+  const RegisterConfiguration* config(
+      RegisterConfiguration::PreserveRootIA32());
+#else
   const RegisterConfiguration* config(RegisterConfiguration::Default());
+#endif
   int allocatable_register_count = config->num_allocatable_general_registers();
   if (with_result) {
     // Overwrite the hole inserted by the deoptimizer with the return value from
@@ -1384,20 +1390,36 @@ void Generate_ContinueToBuiltinHelper(MacroAssembler* masm,
 }  // namespace
 
 void Builtins::Generate_ContinueToCodeStubBuiltin(MacroAssembler* masm) {
+#ifdef V8_EMBEDDED_BUILTINS
+  // TODO(v8:6666): Remove the ifdef once root is preserved by default.
+  Assembler::SupportsRootRegisterScope supports_root_register(masm);
+#endif
   Generate_ContinueToBuiltinHelper(masm, false, false);
 }
 
 void Builtins::Generate_ContinueToCodeStubBuiltinWithResult(
     MacroAssembler* masm) {
+#ifdef V8_EMBEDDED_BUILTINS
+  // TODO(v8:6666): Remove the ifdef once root is preserved by default.
+  Assembler::SupportsRootRegisterScope supports_root_register(masm);
+#endif
   Generate_ContinueToBuiltinHelper(masm, false, true);
 }
 
 void Builtins::Generate_ContinueToJavaScriptBuiltin(MacroAssembler* masm) {
+#ifdef V8_EMBEDDED_BUILTINS
+  // TODO(v8:6666): Remove the ifdef once root is preserved by default.
+  Assembler::SupportsRootRegisterScope supports_root_register(masm);
+#endif
   Generate_ContinueToBuiltinHelper(masm, true, false);
 }
 
 void Builtins::Generate_ContinueToJavaScriptBuiltinWithResult(
     MacroAssembler* masm) {
+#ifdef V8_EMBEDDED_BUILTINS
+  // TODO(v8:6666): Remove the ifdef once root is preserved by default.
+  Assembler::SupportsRootRegisterScope supports_root_register(masm);
+#endif
   Generate_ContinueToBuiltinHelper(masm, true, true);
 }
 

src/deoptimizer.cc

@@ -1476,7 +1476,13 @@ void Deoptimizer::DoComputeBuiltinContinuation(
   const bool must_handle_result =
       !is_topmost || deopt_kind_ == DeoptimizeKind::kLazy;
 
+#if defined(V8_TARGET_ARCH_IA32) && defined(V8_EMBEDDED_BUILTINS)
+  // TODO(v8:6666): Fold into Default config once root is fully supported.
+  const RegisterConfiguration* config(
+      RegisterConfiguration::PreserveRootIA32());
+#else
   const RegisterConfiguration* config(RegisterConfiguration::Default());
+#endif
   const int allocatable_register_count =
       config->num_allocatable_general_registers();
   const int padding_slot_count =