Bug 1657374 - flip flags for wasm simd. r=rhunt

This should be enough to enable wasm simd on x86/x64 in all channels, but
leave it preffed-off on non-nightly.

Differential Revision: https://phabricator.services.mozilla.com/D86822

js/moz.configure

@@ -628,12 +628,12 @@ set_define('ENABLE_SHARED_MEMORY', enable_shared_memory)
 # Support for WebAssembly SIMD
 # =====================================================
 
-@depends('--enable-jit', '--enable-simulator', target, milestone)
-def default_wasm_simd(jit_enabled, simulator, target, milestone):
+@depends('--enable-jit', '--enable-simulator', target)
+def default_wasm_simd(jit_enabled, simulator, target):
     if not jit_enabled or simulator:
         return
 
-    if milestone.is_nightly and target.cpu in ('x86_64', 'x86'):
+    if target.cpu in ('x86_64', 'x86'):
         return True
 
 js_option('--enable-wasm-simd',

modules/libpref/init/all.js

@@ -1106,7 +1106,11 @@ pref("javascript.options.wasm_baselinejit",       true);
   pref("javascript.options.wasm_multi_value",     true);
 #endif
 #ifdef ENABLE_WASM_SIMD
-  pref("javascript.options.wasm_simd",            true);
+  #ifdef NIGHTLY_BUILD
+    pref("javascript.options.wasm_simd",            true);
+  #else
+    pref("javascript.options.wasm_simd",            false);
+  #endif
 #endif
 pref("javascript.options.native_regexp",    true);
 pref("javascript.options.parallel_parsing", true);