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

src/compiler/opcodes.h

Index: src/compiler/opcodes.h
diff --git a/src/compiler/opcodes.h b/src/compiler/opcodes.h
index 37843f34d2be6aa076ca7b9a34543a591d5ef174..99ab119c24db17ee1deed59455e80d3bf5d12b53 100644
--- a/src/compiler/opcodes.h
+++ b/src/compiler/opcodes.h
@@ -32,14 +32,16 @@
   V(End)
 
 // Opcodes for constant operators.
-#define CONSTANT_OP_LIST(V) \
-  V(Int32Constant)          \
-  V(Int64Constant)          \
-  V(Float32Constant)        \
-  V(Float64Constant)        \
-  V(ExternalConstant)       \
-  V(NumberConstant)         \
-  V(HeapConstant)
+#define CONSTANT_OP_LIST(V)   \
+  V(Int32Constant)            \
+  V(Int64Constant)            \
+  V(Float32Constant)          \
+  V(Float64Constant)          \
+  V(ExternalConstant)         \
+  V(NumberConstant)           \
+  V(HeapConstant)             \
+  V(RelocatableInt32Constant) \
+  V(RelocatableInt64Constant)
 
 #define INNER_OP_LIST(V) \
   V(Select)              \
@@ -389,7 +391,7 @@ class IrOpcode {
 
   // Returns true if opcode for constant operator.
   static bool IsConstantOpcode(Value value) {
-    return kInt32Constant <= value && value <= kHeapConstant;
+    return kInt32Constant <= value && value <= kRelocatableInt64Constant;
   }
 
   static bool IsPhiOpcode(Value value) {