[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 06e80301649119ca60b00b057bdc9accc5ff4cf6..31d9e4781960f736b3809e8eb60492b0a2f2f0d7 100644
--- a/src/compiler/js-graph.h
+++ b/src/compiler/js-graph.h
@@ -96,6 +96,10 @@ 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);