Remove instantiator argument in generated code for type tests.

runtime/vm/intermediate_language_arm64.cc

Index: runtime/vm/intermediate_language_arm64.cc
diff --git a/runtime/vm/intermediate_language_arm64.cc b/runtime/vm/intermediate_language_arm64.cc
index 7f85d09ff3ee53d8f1fc77c552c9a6831600ba6c..05ce132c0409ca41b47e6198b720a5863355f5a1 100644
--- a/runtime/vm/intermediate_language_arm64.cc
+++ b/runtime/vm/intermediate_language_arm64.cc
@@ -333,13 +333,12 @@ void UnboxedConstantInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
 
 LocationSummary* AssertAssignableInstr::MakeLocationSummary(Zone* zone,
                                                             bool opt) const {
-  const intptr_t kNumInputs = 3;
+  const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary = new(zone) LocationSummary(
       zone, kNumInputs, kNumTemps, LocationSummary::kCall);
   summary->set_in(0, Location::RegisterLocation(R0));  // Value.
-  summary->set_in(1, Location::RegisterLocation(R2));  // Instantiator.
-  summary->set_in(2, Location::RegisterLocation(R1));  // Type arguments.
+  summary->set_in(1, Location::RegisterLocation(R1));  // Type arguments.
   summary->set_out(0, Location::RegisterLocation(R0));
   return summary;
 }
@@ -1995,13 +1994,12 @@ void StoreStaticFieldInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
 
 LocationSummary* InstanceOfInstr::MakeLocationSummary(Zone* zone,
                                                       bool opt) const {
-  const intptr_t kNumInputs = 3;
+  const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary = new(zone) LocationSummary(
       zone, kNumInputs, kNumTemps, LocationSummary::kCall);
   summary->set_in(0, Location::RegisterLocation(R0));
-  summary->set_in(1, Location::RegisterLocation(R2));
-  summary->set_in(2, Location::RegisterLocation(R1));
+  summary->set_in(1, Location::RegisterLocation(R1));
   summary->set_out(0, Location::RegisterLocation(R0));
   return summary;
 }
@@ -2009,8 +2007,7 @@ LocationSummary* InstanceOfInstr::MakeLocationSummary(Zone* zone,
 
 void InstanceOfInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   ASSERT(locs()->in(0).reg() == R0);  // Value.
-  ASSERT(locs()->in(1).reg() == R2);  // Instantiator.
-  ASSERT(locs()->in(2).reg() == R1);  // Instantiator type arguments.
+  ASSERT(locs()->in(1).reg() == R1);  // Instantiator type arguments.
 
   compiler->GenerateInstanceOf(token_pos(),
                                deopt_id(),