[vm] Rename *MintOp to *Int64Op to emphasis that they operate on unboxed values.

runtime/vm/constant_propagator.cc

Index: runtime/vm/constant_propagator.cc
diff --git a/runtime/vm/constant_propagator.cc b/runtime/vm/constant_propagator.cc
index 40363cbd1f2fd90f6ed87586cdaf79fa6c69d0e8..51d19f377cf6a3086ae497a4dfb3bd9d2922982c 100644
--- a/runtime/vm/constant_propagator.cc
+++ b/runtime/vm/constant_propagator.cc
@@ -681,12 +681,12 @@ void ConstantPropagator::VisitInstanceOf(InstanceOfInstr* instr) {
         (checked_type.IsInt32x4Type() && (rep == kUnboxedInt32x4)) ||
         (checked_type.IsDoubleType() && (rep == kUnboxedDouble) &&
          FlowGraphCompiler::SupportsUnboxedDoubles()) ||
-        (checked_type.IsIntType() && (rep == kUnboxedMint))) {
+        (checked_type.IsIntType() && (rep == kUnboxedInt64))) {
       // Ensure that compile time type matches representation.
       ASSERT(((rep == kUnboxedFloat32x4) && (value_cid == kFloat32x4Cid)) ||
              ((rep == kUnboxedInt32x4) && (value_cid == kInt32x4Cid)) ||
              ((rep == kUnboxedDouble) && (value_cid == kDoubleCid)) ||
-             ((rep == kUnboxedMint) && (value_cid == kMintCid)));
+             ((rep == kUnboxedInt64) && (value_cid == kMintCid)));
       // The representation guarantees the type check to be true.
       SetValue(instr, Bool::True());
     } else {
@@ -906,11 +906,11 @@ void ConstantPropagator::VisitShiftUint32Op(ShiftUint32OpInstr* instr) {
   VisitBinaryIntegerOp(instr);
 }
 
-void ConstantPropagator::VisitBinaryMintOp(BinaryMintOpInstr* instr) {
+void ConstantPropagator::VisitBinaryInt64Op(BinaryInt64OpInstr* instr) {
   VisitBinaryIntegerOp(instr);
 }
 
-void ConstantPropagator::VisitShiftMintOp(ShiftMintOpInstr* instr) {
+void ConstantPropagator::VisitShiftInt64Op(ShiftInt64OpInstr* instr) {
   VisitBinaryIntegerOp(instr);
 }
 
@@ -938,7 +938,7 @@ void ConstantPropagator::VisitUnaryIntegerOp(UnaryIntegerOpInstr* unary_op) {
   SetValue(unary_op, non_constant_);
 }
 
-void ConstantPropagator::VisitUnaryMintOp(UnaryMintOpInstr* instr) {
+void ConstantPropagator::VisitUnaryInt64Op(UnaryInt64OpInstr* instr) {
   VisitUnaryIntegerOp(instr);
 }