[mips64] Use Dsubu in InterpreterPushArgs.

Bug: v8:6488
Change-Id: Icc1e8a71f32592f670f262eb588976c07af41a22
Reviewed-on: https://chromium-review.googlesource.com/541283Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Peter Marshall <petermarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46197}

src/builtins/mips64/builtins-mips64.cc

@@ -1315,7 +1315,7 @@ void Builtins::Generate_InterpreterPushArgsThenCallImpl(
 
   if (mode == InterpreterPushArgsMode::kWithFinalSpread) {
     __ Pop(a2);                   // Pass the spread in a register
-    __ Subu(a0, a0, Operand(1));  // Subtract one for spread
+    __ Dsubu(a0, a0, Operand(1));  // Subtract one for spread
   }
 
   // Call the target.
@@ -1362,7 +1362,7 @@ void Builtins::Generate_InterpreterPushArgsThenConstructImpl(
 
   if (mode == InterpreterPushArgsMode::kWithFinalSpread) {
     __ Pop(a2);                   // Pass the spread in a register
-    __ Subu(a0, a0, Operand(1));  // Subtract one for spread
+    __ Dsubu(a0, a0, Operand(1));  // Subtract one for spread
   } else {
     __ AssertUndefinedOrAllocationSite(a2, t0);
   }