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

test/mjsunit/asm/atomics-store.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 store = stdlib.Atomics.store;
   var fround = stdlib.Math.fround;
 
   function storei8(i, x) {
     i = i | 0;
     x = x | 0;
     return store(MEM8, i, x)|0;
   }
 
   function storei16(i, x) {
@@ skipping 19 matching lines @@
     x = x >>> 0;
     return store(MEMU16, i, x)>>>0;
   }
 
   function storeu32(i, x) {
     i = i | 0;
     x = x >>> 0;
     return store(MEMU32, i, x)>>>0;
   }
 
-  function storef32(i, x) {
-    i = i | 0;
-    x = fround(x);
-    return fround(store(MEMF32, i, x));
-  }
-
-  function storef64(i, x) {
-    i = i | 0;
-    x = +x;
-    return +store(MEMF64, i, x);
-  }
-
   return {
     storei8: storei8,
     storei16: storei16,
     storei32: storei32,
     storeu8: storeu8,
     storeu16: storeu16,
     storeu32: storeu32,
-    storef32: storef32,
-    storef64: storef64
   };
 }
 
 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 11 matching lines @@
   assertEquals(oobValue, f(-1, 0), name);
   assertEquals(oobValue, f(ta.length, 0), name);
 }
 
 testElementType(Int8Array, m.storei8, 0);
 testElementType(Int16Array, m.storei16, 0);
 testElementType(Int32Array, m.storei32, 0);
 testElementType(Uint8Array, m.storeu8, 0);
 testElementType(Uint16Array, m.storeu16, 0);
 testElementType(Uint32Array, m.storeu32, 0);
-testElementType(Float32Array, m.storef32, NaN);
-testElementType(Float64Array, m.storef64, NaN);