[wasm] Remove obsolete %IsNotAsmWasmCode predicate.

test/mjsunit/regress/regress-618608.js

Index: test/mjsunit/regress/regress-618608.js
diff --git a/test/mjsunit/regress/regress-618608.js b/test/mjsunit/regress/regress-618608.js
index 0a882160e1489065e502848913612945e16a2a37..102452e4b8676c8e3577a716e4eca2555cfe1035 100644
--- a/test/mjsunit/regress/regress-618608.js
+++ b/test/mjsunit/regress/regress-618608.js
@@ -14,11 +14,11 @@
 var Wasm = {
   instantiateModuleFromAsm: function(text, stdlib, ffi, heap) {
     var module_decl = eval('(' + text + ')');
-    if (%IsNotAsmWasmCode(module_decl)) {
+    if (!%IsAsmWasmCode(module_decl)) {
       throw "validate failure";
     }
     var ret = module_decl(stdlib, ffi, heap);
-    if (%IsNotAsmWasmCode(module_decl)) {
+    if (!%IsAsmWasmCode(module_decl)) {
       throw "bad module args";
     }
     return ret;