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

src/compiler/common-node-cache.h

Index: src/compiler/common-node-cache.h
diff --git a/src/compiler/common-node-cache.h b/src/compiler/common-node-cache.h
index 720bc1531dd47c46df3cc577eee94bf984587ee5..cee0c4e837c6c4706c7fb03368534deb554bbd45 100644
--- a/src/compiler/common-node-cache.h
+++ b/src/compiler/common-node-cache.h
@@ -52,6 +52,14 @@ class CommonNodeCache final {
 
   Node** FindHeapConstant(Handle<HeapObject> value);
 
+  Node** FindRelocatableInt32Constant(int32_t value) {
+    return relocatable_int32_constants_.Find(zone(), value);
+  }
+
+  Node** FindRelocatableInt64Constant(int64_t value) {
+    return relocatable_int64_constants_.Find(zone(), value);
+  }
+
   // Return all nodes from the cache.
   void GetCachedNodes(ZoneVector<Node*>* nodes);
 
@@ -65,6 +73,8 @@ class CommonNodeCache final {
   IntPtrNodeCache external_constants_;
   Int64NodeCache number_constants_;
   IntPtrNodeCache heap_constants_;
+  Int32NodeCache relocatable_int32_constants_;
+  Int64NodeCache relocatable_int64_constants_;
   Zone* const zone_;
 
   DISALLOW_COPY_AND_ASSIGN(CommonNodeCache);