Bug 1280933 - disable test on 32-bit platforms. r=me

--HG--
extra : rebase_source : e00473d12a7d4dacabe2cc0046c36ec1027ec1c1

js/src/jit-test/tests/wasm/regress/reserve-joinreg.js

@@ -1,6 +1,9 @@
 // |jit-test| test-also-wasm-baseline
 load(libdir + "wasm.js");
 
+if (!hasI64())
+    quit(0);
+
 // Bug 1280933, excerpted from binary test case provided there.
 
 wasmEvalText(