Assembler changes for enabling GrowHeap in Wasm

src/arm64/assembler-arm64-inl.h

Index: src/arm64/assembler-arm64-inl.h
diff --git a/src/arm64/assembler-arm64-inl.h b/src/arm64/assembler-arm64-inl.h
index aeca563c37f577b5a2582ea3605c026d6ca23704..e778ded67f4239530ea33aa8f5d2988d8d529aac 100644
--- a/src/arm64/assembler-arm64-inl.h
+++ b/src/arm64/assembler-arm64-inl.h
@@ -41,6 +41,19 @@ void RelocInfo::set_target_address(Address target,
   }
 }
 
+void RelocInfo::update_wasm_memory_reference(
+    Address old_base, Address new_base, size_t old_size, size_t new_size,
+    ICacheFlushMode icache_flush_mode) {
+  DCHECK(IsWasmMemoryReference(rmode_));
+  DCHECK(old_size <= new_size);

[titzer, 2016/03/14 15:23:38]

Same comments as on arm. 

[gdeepti1, 2016/03/14 20:08:14]

Fixed for all architectures. 

+  DCHECK(old_base <= wasm_memory_reference() &&
+         wasm_memory_reference() <= old_base + old_size);
+  Address updated_reference = wasm_memory_reference() + (new_base - old_base);
+  DCHECK(new_base <= updated_reference &&
+         updated_reference <= new_base + new_size);
+  Assembler::set_target_address_at(isolate_, pc_, host_, updated_reference,
+                                   icache_flush_mode);
+}
 
 inline int CPURegister::code() const {
   DCHECK(IsValid());
@@ -693,6 +706,10 @@ Address RelocInfo::target_address() {
   return Assembler::target_address_at(pc_, host_);
 }
 
+Address RelocInfo::wasm_memory_reference() {
+  DCHECK(IsWasmMemoryReference(rmode_));
+  return Assembler::target_address_at(pc_, host_);
+}
 
 Address RelocInfo::target_address_address() {
   DCHECK(IsCodeTarget(rmode_) || IsRuntimeEntry(rmode_)