[asm] Fix lots of invalid asm.js tests

test/mjsunit/asm/float64array-negative-offset.js

Index: test/mjsunit/asm/float64array-negative-offset.js
diff --git a/test/mjsunit/asm/float64array-negative-offset.js b/test/mjsunit/asm/float64array-negative-offset.js
index 154bd82cd379a0ea932fb5e6dd989cd0d5b1bbc4..76be0ced014f67af7d08068cb273d4f0248d49ca 100644
--- a/test/mjsunit/asm/float64array-negative-offset.js
+++ b/test/mjsunit/asm/float64array-negative-offset.js
@@ -12,8 +12,7 @@ var m = (function Module(stdlib, foreign, heap) {
   var MEM64 = new stdlib.Float64Array(heap);
   function load(i) {
     i = i|0;
-    i = +MEM64[i >> 3];
-    return i;
+    return +MEM64[i >> 3];
   }
   function store(i, v) {
     i = i|0;
@@ -22,8 +21,7 @@ var m = (function Module(stdlib, foreign, heap) {
   }
   function load8(i) {
     i = i|0;
-    i = +MEM64[i + 8 >> 3];
-    return i;
+    return +MEM64[i + 8 >> 3];
   }
   function store8(i, v) {
     i = i|0;