[wasm] Fix access first parameter in GenericJSToWasmWrapper

Adapt GenericJSToWasmWrapper to support reversed arguments stack.

Change-Id: I46f6492cd8a933a7670eb2ad436a1ac84b055e60
Bug: v8:10201
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2366702
Auto-Submit: Victor Gomes <victorgomes@chromium.org>
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69504}

src/builtins/x64/builtins-x64.cc

@@ -3286,7 +3286,12 @@ void Builtins::Generate_GenericJSToWasmWrapper(MacroAssembler* masm) {
 
   // Param handling.
   Register param = rax;
-  const int firstParamOffset = 16;
+#ifdef V8_REVERSE_JSARGS
+  const int firstParamOffset = kFPOnStackSize + kPCOnStackSize +
+                               kSystemPointerSize;  // Skips the receiver.
+#else
+  const int firstParamOffset = kFPOnStackSize + kPCOnStackSize;
+#endif
   __ movq(param, MemOperand(rbp, firstParamOffset));
 
   Label not_smi;