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

src/compiler/js-graph.h

Index: src/compiler/js-graph.h
diff --git a/src/compiler/js-graph.h b/src/compiler/js-graph.h
index 5a25ed0697c8c335998920d82b7430d52ca950a2..1763455a16568069fde2e309f17539157f2233f0 100644
--- a/src/compiler/js-graph.h
+++ b/src/compiler/js-graph.h
@@ -95,6 +95,10 @@ class JSGraph : public ZoneObject {
     return IntPtrConstant(bit_cast<intptr_t>(value));
   }
 
+  Node* RelocatableInt32Constant(int32_t value, RelocInfo::Mode rmode);
+  Node* RelocatableInt64Constant(int64_t value, RelocInfo::Mode rmode);
+  Node* RelocatableIntPtrConstant(intptr_t value, RelocInfo::Mode rmode);
+
   // Creates a Float32Constant node, usually canonicalized.
   Node* Float32Constant(float value);