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

src/compiler/ia32/code-generator-ia32.cc

Index: src/compiler/ia32/code-generator-ia32.cc
diff --git a/src/compiler/ia32/code-generator-ia32.cc b/src/compiler/ia32/code-generator-ia32.cc
index 4dc01b43208bbda09227834c32f00ba80f9f7dbf..c69ce0b0c151c9581b8cff86e9057ea08e7f0ffd 100644
--- a/src/compiler/ia32/code-generator-ia32.cc
+++ b/src/compiler/ia32/code-generator-ia32.cc
@@ -65,6 +65,11 @@ class IA32OperandConverter : public InstructionOperandConverter {
 
   Immediate ToImmediate(InstructionOperand* operand) {
     Constant constant = ToConstant(operand);
+    if (constant.type() == Constant::kInt32 &&
+        constant.rmode() == RelocInfo::WASM_MEMORY_REFERENCE) {
+      return Immediate(reinterpret_cast<Address>(constant.ToInt32()),
+                       constant.rmode());
+    }
     switch (constant.type()) {
       case Constant::kInt32:
         return Immediate(constant.ToInt32());