[Atomics] Remove support for atomic accesses on floating-point values.

test/mjsunit/asm/atomics-load.js

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Flags: --harmony-sharedarraybuffer
 
 function Module(stdlib, foreign, heap) {
   "use asm";
   var MEM8 = new stdlib.Int8Array(heap);
   var MEM16 = new stdlib.Int16Array(heap);
   var MEM32 = new stdlib.Int32Array(heap);
   var MEMU8 = new stdlib.Uint8Array(heap);
   var MEMU16 = new stdlib.Uint16Array(heap);
   var MEMU32 = new stdlib.Uint32Array(heap);
-  var MEMF32 = new stdlib.Float32Array(heap);
-  var MEMF64 = new stdlib.Float64Array(heap);
   var load = stdlib.Atomics.load;
   var fround = stdlib.Math.fround;
 
   function loadi8(i) {
     i = i | 0;
     return load(MEM8, i)|0;
   }
 
   function loadi16(i) {
     i = i | 0;
@@ skipping 13 matching lines @@
   function loadu16(i) {
     i = i | 0;
     return load(MEMU16, i)>>>0;
   }
 
   function loadu32(i) {
     i = i | 0;
     return load(MEMU32, i)>>>0;
   }
 
-  function loadf32(i) {
-    i = i | 0;
-    return fround(load(MEMF32, i));
-  }
-
-  function loadf64(i) {
-    i = i | 0;
-    return +load(MEMF64, i);
-  }
-
   return {
     loadi8: loadi8,
     loadi16: loadi16,
     loadi32: loadi32,
     loadu8: loadu8,
     loadu16: loadu16,
     loadu32: loadu32,
-    loadf32: loadf32,
-    loadf64: loadf64
   };
 }
 
 var sab = new SharedArrayBuffer(16);
 var m = Module(this, {}, sab);
 
 function clearArray() {
   var ui8 = new Uint8Array(sab);
   for (var i = 0; i < sab.byteLength; ++i) {
     ui8[i] = 0;
@@ skipping 12 matching lines @@
   assertEquals(oobValue, f(-1), name);
   assertEquals(oobValue, f(ta.length), name);
 }
 
 testElementType(Int8Array, m.loadi8, 0);
 testElementType(Int16Array, m.loadi16, 0);
 testElementType(Int32Array, m.loadi32, 0);
 testElementType(Uint8Array, m.loadu8, 0);
 testElementType(Uint16Array, m.loadu16, 0);
 testElementType(Uint32Array, m.loadu32, 0);
-testElementType(Float32Array, m.loadf32, NaN);
-testElementType(Float64Array, m.loadf64, NaN);