Remove unused pc descriptor types.

runtime/vm/debugger_arm64.cc

Index: runtime/vm/debugger_arm64.cc
diff --git a/runtime/vm/debugger_arm64.cc b/runtime/vm/debugger_arm64.cc
index ff099e26c6534179d93c22da58331881eb6e89e0..0674495f4ce9aab7e684280f7581015d9ae3863a 100644
--- a/runtime/vm/debugger_arm64.cc
+++ b/runtime/vm/debugger_arm64.cc
@@ -27,9 +27,6 @@ void CodeBreakpoint::PatchCode() {
     case RawPcDescriptors::kUnoptStaticCall:
       stub_target = stub_code->ICCallBreakpointEntryPoint();
       break;
-    case RawPcDescriptors::kClosureCall:
-      stub_target = stub_code->ClosureCallBreakpointEntryPoint();
-      break;
     case RawPcDescriptors::kRuntimeCall: {
       stub_target = stub_code->RuntimeCallBreakpointEntryPoint();
       break;
@@ -50,7 +47,6 @@ void CodeBreakpoint::RestoreCode() {
   switch (breakpoint_kind_) {
     case RawPcDescriptors::kIcCall:
     case RawPcDescriptors::kUnoptStaticCall:
-    case RawPcDescriptors::kClosureCall:
     case RawPcDescriptors::kRuntimeCall: {
       CodePatcher::PatchPoolPointerCallAt(pc_, code, saved_value_);
       break;