[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 fa6c710c279c3e0821766204958224c27c0bedd4..b90754a6869f795ef95f0068d2bc32b203dc8391 100644
--- a/src/x64/macro-assembler-x64.cc
+++ b/src/x64/macro-assembler-x64.cc
@@ -1114,15 +1114,6 @@ void MacroAssembler::Set(Register dst, int64_t x) {
   }
 }
 
-void MacroAssembler::Set(Register dst, int64_t x, RelocInfo::Mode rmode) {

[gdeepti1, 2016/03/18 23:47:45]

No longer required as the optimizations and check for x being 0 are removed,
src/compiler/x64/code-generator-x64.cc now generates the movq instruction.
Additional checking removed because correct patchable constants are being
generated, x = 0 can be allowed in the future to check for Wasm with modules
with no memory. 

-  if (rmode == RelocInfo::WASM_MEMORY_REFERENCE) {
-    DCHECK(x != 0);
-    movq(dst, x, rmode);
-  } else {
-    DCHECK(RelocInfo::IsNone(rmode));
-  }
-}
-
 void MacroAssembler::Set(const Operand& dst, intptr_t x) {
   if (kPointerSize == kInt64Size) {
     if (is_int32(x)) {