Backed out changeset b2fb7cd41c79 (bug 1528869) for failing at /waiterlist-order-of-operations-is-fifo.js on a CLOSED TREE.

js/public/ContextOptions.h

@@ -19,9 +19,15 @@ class JS_PUBLIC_API ContextOptions {
  public:
   ContextOptions()
       : baseline_(true),
+#ifdef JS_CODEGEN_ARM64
+        ion_(false),
+        asmJS_(false),
+        wasm_(false),
+#else
         ion_(true),
         asmJS_(true),
         wasm_(true),
+#endif
         wasmVerbose_(false),
         wasmBaseline_(true),
         wasmIon_(true),

js/src/shell/js.cpp

@@ -9839,14 +9839,25 @@ static MOZ_MUST_USE bool ProcessArgs(JSContext* cx, OptionParser* op) {
 
 static bool SetContextOptions(JSContext* cx, const OptionParser& op) {
   enableBaseline = !op.getBoolOption("no-baseline");
+#ifdef JS_CODEGEN_ARM64
+  // TODO: Enable Ion by default.
+  enableIon = false;
+  enableAsmJS = false;
+#else
   enableIon = !op.getBoolOption("no-ion");
   enableAsmJS = !op.getBoolOption("no-asmjs");
+#endif
   enableNativeRegExp = !op.getBoolOption("no-native-regexp");
 
   // Default values for wasm.
   enableWasm = true;
   enableWasmBaseline = true;
+#ifdef JS_CODEGEN_ARM64
+  // TODO: Enable WasmIon by default.
+  enableWasmIon = false;
+#else
   enableWasmIon = true;
+#endif
   if (const char* str = op.getStringOption("wasm-compiler")) {
     if (strcmp(str, "none") == 0) {
       enableWasm = false;