ARM: Make use of d16-d31 when available.

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

Index: src/arm/lithium-gap-resolver-arm.cc
diff --git a/src/arm/lithium-gap-resolver-arm.cc b/src/arm/lithium-gap-resolver-arm.cc
index c100720d89cd6130ad3e3a04a9528c48c045f5f7..2552d6da49145dfe73d26e9d634b73fb5245a72d 100644
--- a/src/arm/lithium-gap-resolver-arm.cc
+++ b/src/arm/lithium-gap-resolver-arm.cc
@@ -171,9 +171,9 @@ void LGapResolver::BreakCycle(int index) {
   } else if (source->IsStackSlot()) {
     __ ldr(kSavedValueRegister, cgen_->ToMemOperand(source));
   } else if (source->IsDoubleRegister()) {
-    __ vmov(kScratchDoubleReg, cgen_->ToDoubleRegister(source));
+    __ vmov(DwVfpRegister::ScratchReg(), cgen_->ToDoubleRegister(source));
   } else if (source->IsDoubleStackSlot()) {
-    __ vldr(kScratchDoubleReg, cgen_->ToMemOperand(source));
+    __ vldr(DwVfpRegister::ScratchReg(), cgen_->ToMemOperand(source));
   } else {
     UNREACHABLE();
   }
@@ -192,9 +192,11 @@ void LGapResolver::RestoreValue() {
   } else if (saved_destination_->IsStackSlot()) {
     __ str(kSavedValueRegister, cgen_->ToMemOperand(saved_destination_));
   } else if (saved_destination_->IsDoubleRegister()) {
-    __ vmov(cgen_->ToDoubleRegister(saved_destination_), kScratchDoubleReg);
+    __ vmov(cgen_->ToDoubleRegister(saved_destination_),
+            DwVfpRegister::ScratchReg());
   } else if (saved_destination_->IsDoubleStackSlot()) {
-    __ vstr(kScratchDoubleReg, cgen_->ToMemOperand(saved_destination_));
+    __ vstr(DwVfpRegister::ScratchReg(),
+            cgen_->ToMemOperand(saved_destination_));
   } else {
     UNREACHABLE();
   }
@@ -232,8 +234,8 @@ void LGapResolver::EmitMove(int index) {
           // ip is overwritten while saving the value to the destination.
           // Therefore we can't use ip.  It is OK if the read from the source
           // destroys ip, since that happens before the value is read.
-          __ vldr(kScratchDoubleReg.low(), source_operand);
-          __ vstr(kScratchDoubleReg.low(), destination_operand);
+          __ vldr(DwVfpRegister::ScratchReg().low(), source_operand);
+          __ vstr(DwVfpRegister::ScratchReg().low(), destination_operand);
         } else {
           __ ldr(ip, source_operand);
           __ str(ip, destination_operand);
@@ -294,8 +296,8 @@ void LGapResolver::EmitMove(int index) {
         __ ldr(kSavedValueRegister, source_high_operand);
         __ str(kSavedValueRegister, destination_high_operand);
       } else {
-        __ vldr(kScratchDoubleReg, source_operand);
-        __ vstr(kScratchDoubleReg, destination_operand);
+        __ vldr(DwVfpRegister::ScratchReg(), source_operand);
+        __ vstr(DwVfpRegister::ScratchReg(), destination_operand);
       }
     }
   } else {