Remove unused pc descriptor types.

runtime/vm/stub_code_arm64.cc

Index: runtime/vm/stub_code_arm64.cc
diff --git a/runtime/vm/stub_code_arm64.cc b/runtime/vm/stub_code_arm64.cc
index e443039ff3fbb3037bf44661edcb49147c505279..7b51dbfa54b309b6270778be1bed210b8c455cb5 100644
--- a/runtime/vm/stub_code_arm64.cc
+++ b/runtime/vm/stub_code_arm64.cc
@@ -1792,23 +1792,6 @@ void StubCode::GenerateICCallBreakpointStub(Assembler* assembler) {
 }
 
 
-// R5: Contains Smi 0 (need to preserve a GC-safe value for the lazy compile
-// stub).
-// R4: Contains an arguments descriptor.
-void StubCode::GenerateClosureCallBreakpointStub(Assembler* assembler) {
-  __ EnterStubFrame();
-  __ Push(R5);
-  __ Push(R4);
-  __ PushObject(Object::null_object(), PP);  // Space for result.
-  __ CallRuntime(kBreakpointRuntimeHandlerRuntimeEntry, 0);
-  __ Pop(R0);
-  __ Pop(R4);
-  __ Pop(R5);
-  __ LeaveStubFrame();
-  __ br(R0);
-}
-
-
 void StubCode::GenerateRuntimeCallBreakpointStub(Assembler* assembler) {
   __ EnterStubFrame();
   __ PushObject(Object::null_object(), PP);  // Space for result.