Assembler changes for enabling GrowHeap in Wasm

src/ia32/assembler-ia32.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // All Rights Reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 // - Redistributions of source code must retain the above copyright notice,
 // this list of conditions and the following disclaimer.
 //
@@ skipping 253 matching lines @@
 // -----------------------------------------------------------------------------
 // Machine instruction Immediates
 
 class Immediate BASE_EMBEDDED {
  public:
   inline explicit Immediate(int x);
   inline explicit Immediate(const ExternalReference& ext);
   inline explicit Immediate(Handle<Object> handle);
   inline explicit Immediate(Smi* value);
   inline explicit Immediate(Address addr);
+  inline explicit Immediate(int x, RelocInfo::Mode rmode);

[Yang, 2016/03/03 06:21:56]

If I understand correctly, we use this to embed an address into the wasm heap
with this, right? Can we use the signation Immediate(Address, RelocInfo::Mode)
here? Otherwise you are just going to invite abuse.

[gdeepti1, 2016/03/03 18:00:10]

Done.

 
   static Immediate CodeRelativeOffset(Label* label) {
     return Immediate(label);
   }
 
   bool is_zero() const { return x_ == 0 && RelocInfo::IsNone(rmode_); }
   bool is_int8() const {
     return -128 <= x_ && x_ < 128 && RelocInfo::IsNone(rmode_);
   }
   bool is_int16() const {
@@ skipping 1289 matching lines @@
   Assembler* assembler_;
 #ifdef DEBUG
   int space_before_;
 #endif
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_IA32_ASSEMBLER_IA32_H_