PPC/s390: [wasm] Add a generic js-to-wasm wrapper

Port 1250fd59

Original Commit Message:

    This generic wrapper builtin is currently used only when the wasm
    function has no parameters and no return value.

    Added a new V8 flag to use this generic wrapper.

    Also added a JS test function for this generic wrapper.

R=evih@google.com, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=
LOG=N

Change-Id: Ib1f14081779adaf3668c4936ba6afde0a782ce0d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2323310Reviewed-by: Junliang Yan <jyan@ca.ibm.com>
Commit-Queue: Milad Farazmand <miladfar@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#69103}

src/builtins/ppc/builtins-ppc.cc

@@ -2966,6 +2966,11 @@ void Builtins::Generate_DoubleToI(MacroAssembler* masm) {
   __ Ret();
 }
 
+void Builtins::Generate_GenericJSToWasmWrapper(MacroAssembler* masm) {
+  // TODO(v8:10701): Implement for this platform.
+  __ Trap();
+}
+
 namespace {
 
 static int AddressOffset(ExternalReference ref0, ExternalReference ref1) {

src/builtins/s390/builtins-s390.cc

@@ -3014,6 +3014,11 @@ void Builtins::Generate_DoubleToI(MacroAssembler* masm) {
   __ Ret();
 }
 
+void Builtins::Generate_GenericJSToWasmWrapper(MacroAssembler* masm) {
+  // TODO(v8:10701): Implement for this platform.
+  __ Trap();
+}
+
 namespace {
 
 static int AddressOffset(ExternalReference ref0, ExternalReference ref1) {