VM: Simplify assembler test by removing unused parameter.

runtime/vm/simulator_mips.h

Index: runtime/vm/simulator_mips.h
diff --git a/runtime/vm/simulator_mips.h b/runtime/vm/simulator_mips.h
index 4243072517b0432138962add2e06154b440b0b05..b4807bf8bdf31702421313c913c57c306067a4fe 100644
--- a/runtime/vm/simulator_mips.h
+++ b/runtime/vm/simulator_mips.h
@@ -104,7 +104,7 @@ class Simulator {
   // Call on program start.
   static void InitOnce();
 
-  // Dart generally calls into generated code with 5 parameters. This is a
+  // Dart generally calls into generated code with 4 parameters. This is a
   // convenience function, which sets up the simulator state and grabs the
   // result on return. When fp_return is true the return value is the D0
   // floating point register. Otherwise, the return value is V1:V0.