Generate StoreGlobal stubs with Hydrogen

src/x64/lithium-gap-resolver-x64.cc

Index: src/x64/lithium-gap-resolver-x64.cc
diff --git a/src/x64/lithium-gap-resolver-x64.cc b/src/x64/lithium-gap-resolver-x64.cc
index fd74e0aacd9ed0562daea799d6baacabc8661cef..9f93b8428363dd78c86abd44494bfa8713fa6557 100644
--- a/src/x64/lithium-gap-resolver-x64.cc
+++ b/src/x64/lithium-gap-resolver-x64.cc
@@ -202,6 +202,20 @@ void LGapResolver::EmitMove(int index) {
       } else {
         __ LoadObject(dst, cgen_->ToHandle(constant_source));
       }
+    } else if (destination->IsDoubleRegister()) {
+      double v = cgen_->ToDouble(constant_source);
+      uint64_t int_val = BitCast<uint64_t, double>(v);
+      int32_t lower = static_cast<int32_t>(int_val);
+      int32_t upper = static_cast<int32_t>(int_val >> (kBitsPerInt));
+      XMMRegister dst = cgen_->ToDoubleRegister(destination);
+      if (int_val == 0) {
+        __ xorps(dst, dst);
+      } else {
+        __ push(Immediate(upper));
+        __ push(Immediate(lower));
+        __ movsd(dst, Operand(rsp, 0));
+        __ addq(rsp, Immediate(kDoubleSize));
+      }
     } else {
       ASSERT(destination->IsStackSlot());
       Operand dst = cgen_->ToOperand(destination);