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

src/compiler/js-graph.cc

Index: src/compiler/js-graph.cc
diff --git a/src/compiler/js-graph.cc b/src/compiler/js-graph.cc
index 98ca7aa3c3f831dc36bb59e569ebc772447dedfc..b5e01cf966b4af80fab9d67e7c0b55f5b0f7f91d 100644
--- a/src/compiler/js-graph.cc
+++ b/src/compiler/js-graph.cc
@@ -139,6 +139,28 @@ Node* JSGraph::Int64Constant(int64_t value) {
   return *loc;
 }
 
+Node* JSGraph::RelocatableInt32Constant(int32_t value, RelocInfo::Mode rmode) {
+  Node** loc = cache_.FindRelocatableInt32Constant(value);
+  if (*loc == nullptr) {
+    *loc = graph()->NewNode(common()->RelocatableInt32Constant(value, rmode));
+  }
+  return *loc;
+}
+
+Node* JSGraph::RelocatableInt64Constant(int64_t value, RelocInfo::Mode rmode) {
+  Node** loc = cache_.FindRelocatableInt64Constant(value);
+  if (*loc == nullptr) {
+    *loc = graph()->NewNode(common()->RelocatableInt64Constant(value, rmode));
+  }
+  return *loc;
+}
+
+Node* JSGraph::RelocatableIntPtrConstant(intptr_t value,
+                                         RelocInfo::Mode rmode) {
+  return kPointerSize == 8
+             ? RelocatableInt64Constant(value, rmode)
+             : RelocatableInt32Constant(static_cast<int>(value), rmode);
+}
 
 Node* JSGraph::NumberConstant(double value) {
   Node** loc = cache_.FindNumberConstant(value);