fix performance regression on intel call api stubs

src/x64/interface-descriptors-x64.cc

Index: src/x64/interface-descriptors-x64.cc
diff --git a/src/x64/interface-descriptors-x64.cc b/src/x64/interface-descriptors-x64.cc
index 86c92469c77834f038c360a52c9f9a0a0e90b946..014fe3dfbb35e2de5798c551e9195aee4880b707 100644
--- a/src/x64/interface-descriptors-x64.cc
+++ b/src/x64/interface-descriptors-x64.cc
@@ -297,11 +297,11 @@ void ArgumentAdaptorDescriptor::Initialize(CallInterfaceDescriptorData* data) {
 void ApiFunctionDescriptor::Initialize(CallInterfaceDescriptorData* data) {
   Register registers[] = {
       rsi,  // context
-      rax,  // callee
+      rdi,  // callee
       rbx,  // call_data
       rcx,  // holder
       rdx,  // api_function_address
-      rdi,  // actual number of arguments
+      rax,  // actual number of arguments
   };
   Representation representations[] = {
       Representation::Tagged(),     // context
@@ -318,7 +318,7 @@ void ApiFunctionDescriptor::Initialize(CallInterfaceDescriptorData* data) {
 void ApiAccessorDescriptor::Initialize(CallInterfaceDescriptorData* data) {
   Register registers[] = {
       rsi,  // context
-      rax,  // callee
+      rdi,  // callee
       rbx,  // call_data
       rcx,  // holder
       rdx,  // api_function_address