Use GPRs for mints

runtime/vm/assembler_arm.cc

Index: runtime/vm/assembler_arm.cc
diff --git a/runtime/vm/assembler_arm.cc b/runtime/vm/assembler_arm.cc
index d712f9825fd722502e49e3af46c84cb2ca294ecf..a7c442d138b943ff68a95599f5f13b1967f1c099 100644
--- a/runtime/vm/assembler_arm.cc
+++ b/runtime/vm/assembler_arm.cc
@@ -273,12 +273,24 @@ void Assembler::adc(Register rd, Register rn, ShifterOperand so,
 }
 
 
+void Assembler::adcs(Register rd, Register rn, ShifterOperand so,
+                    Condition cond) {
+  EmitType01(cond, so.type(), ADC, 1, rn, rd, so);
+}
+
+
 void Assembler::sbc(Register rd, Register rn, ShifterOperand so,
                     Condition cond) {
   EmitType01(cond, so.type(), SBC, 0, rn, rd, so);
 }
 
 
+void Assembler::sbcs(Register rd, Register rn, ShifterOperand so,
+                    Condition cond) {
+  EmitType01(cond, so.type(), SBC, 1, rn, rd, so);
+}
+
+
 void Assembler::rsc(Register rd, Register rn, ShifterOperand so,
                     Condition cond) {
   EmitType01(cond, so.type(), RSC, 0, rn, rd, so);
@@ -2161,6 +2173,11 @@ void Assembler::Rrx(Register rd, Register rm, Condition cond) {
 }
 
 
+void Assembler::SignFill(Register rd, Register rm) {
+  Asr(rd, rm, 31);
+}
+
+
 void Assembler::Vreciprocalqs(QRegister qd, QRegister qm) {
   ASSERT(qm != QTMP);
   ASSERT(qd != QTMP);