Bug 1644554 - Block V128 in the Jit ABI r=bbouvier

See bug for further description.

Differential Revision: https://phabricator.services.mozilla.com/D79415

js/src/wasm/WasmStubs.cpp

@@ -1832,7 +1832,15 @@ static void FillArgumentArrayForExit(
                 "FillArgumentArrayForExit, ABIArg::Stack: unexpected type");
           }
         } else {
-          StackCopy(masm, type, scratch, src, dst);
+          if (type == MIRType::Simd128) {
+            // As above.  StackCopy does not know this trick.
+            ScratchDoubleScope dscratch(masm);
+            masm.loadConstantDouble(0, dscratch);
+            GenPrintF64(DebugChannel::Import, masm, dscratch);
+            masm.storeDouble(dscratch, dst);
+          } else {
+            StackCopy(masm, type, scratch, src, dst);
+          }
         }
         break;
       }