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

src/x64/macro-assembler-x64.cc

Index: src/x64/macro-assembler-x64.cc
diff --git a/src/x64/macro-assembler-x64.cc b/src/x64/macro-assembler-x64.cc
index e72d40b4aec743f4db9f5a27a81d25c2d5657010..cbcbe91ecada9a5ed73093bab1f97225fc1ab608 100644
--- a/src/x64/macro-assembler-x64.cc
+++ b/src/x64/macro-assembler-x64.cc
@@ -1114,6 +1114,17 @@ void MacroAssembler::Set(Register dst, int64_t x) {
   }
 }
 
+void MacroAssembler::Set(Register dst, int64_t x, RelocInfo::Mode rmode) {
+  if (x == 0) {
+    xorl(dst, dst);
+  } else if (is_uint32(x)) {
+    movl(dst, Immediate(reinterpret_cast<Address>(x), rmode));
+  } else if (is_int32(x)) {
+    movq(dst, Immediate(reinterpret_cast<Address>(x), rmode));
+  } else {
+    movq(dst, x, rmode);
+  }
+}
 
 void MacroAssembler::Set(const Operand& dst, intptr_t x) {
   if (kPointerSize == kInt64Size) {