Populate relocation information correctly for RelocatableInt32Constants.

test/mjsunit/wasm/grow-memory.js

 // Copyright 2016 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: --expose-wasm --expose-gc --stress-compaction
 
 load("test/mjsunit/wasm/wasm-constants.js");
 load("test/mjsunit/wasm/wasm-module-builder.js");
 
 var kPageSize = 0x10000;
@@ skipping 99 matching lines @@
 function testGrowMemoryTrapMaxPages() {
   var builder = genGrowMemoryBuilder();
   builder.addMemory(1, 1, false);
   var module = builder.instantiate();
   var maxPages = 16384;
   function growMem(pages) { return module.exports.grow_memory(pages); }
   assertEquals(-1, growMem(maxPages));
 }
 
 testGrowMemoryTrapMaxPages();
+
+function testGrowMemoryCurrentMemory() {
+  var builder = genGrowMemoryBuilder();
+  builder.addMemory(1, 1, false);
+  builder.addFunction("memory_size", kSig_i_v)
+      .addBody([kExprMemorySize])
+      .exportFunc();
+  var module = builder.instantiate();
+  function growMem(pages) { return module.exports.grow_memory(pages); }
+  function MemSize() { return module.exports.memory_size(); }
+
+  assertEquals(65536, MemSize());
+  assertEquals(1, growMem(1));
+  assertEquals(131072, MemSize());
+}
+
+testGrowMemoryCurrentMemory();