[compiler] Add relocatable pointer constants for wasm memory references.

src/arm/assembler-arm-inl.h

Index: src/arm/assembler-arm-inl.h
diff --git a/src/arm/assembler-arm-inl.h b/src/arm/assembler-arm-inl.h
index 0de96428f33789b66d76d5a1293af8a7276d844d..d35b67092ef2dfcb6618753df8fd2bd717cc5a31 100644
--- a/src/arm/assembler-arm-inl.h
+++ b/src/arm/assembler-arm-inl.h
@@ -71,6 +71,10 @@ 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_)
@@ -114,6 +118,12 @@ void RelocInfo::set_target_address(Address target,
   }
 }
 
+void RelocInfo::update_wasm_memory_reference(

[Yang, 2016/03/07 06:21:22]

I think Ben's idea of "update" was to provide the original memory start, the new
memory start, and let the method take care of the offset calculation.

The way it is currently implemented ought to be called set_wasm_memory_reference
to be inline with other setters and getters.

[gdeepti1, 2016/03/08 04:22:51]

Changed the updated interface -
https://codereview.chromium.org/1759873002/diff/180001/src/arm/assembler-arm-...

+    Address reference, ICacheFlushMode icache_flush_mode) {
+  DCHECK(IsWasmMemoryReference(rmode_));
+  Assembler::set_target_address_at(isolate_, pc_, host_, reference,
+                                   icache_flush_mode);
+}
 
 Object* RelocInfo::target_object() {
   DCHECK(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);