Specialize breakpoint stubs by set of live registers of the stubs they are intercepting.

runtime/vm/debugger_mips.cc

Index: runtime/vm/debugger_mips.cc
diff --git a/runtime/vm/debugger_mips.cc b/runtime/vm/debugger_mips.cc
index 570d4d015dccc20bb5af8b391cb19b5ab4ec9925..759ea0fb2f240165fc404ba4cfb770ea01071eab 100644
--- a/runtime/vm/debugger_mips.cc
+++ b/runtime/vm/debugger_mips.cc
@@ -46,12 +46,22 @@ void CodeBreakpoint::PatchCode() {
     WritableInstructionsScope writable(instrs.EntryPoint(), instrs.size());
     switch (breakpoint_kind_) {
       case PcDescriptors::kIcCall:
-      case PcDescriptors::kUnoptStaticCall:
-      case PcDescriptors::kRuntimeCall:
+      case PcDescriptors::kUnoptStaticCall: {
+        saved_value_ = CodePatcher::GetStaticCallTargetAt(pc_, code);
+        CodePatcher::PatchStaticCallAt(
+            pc_, code, StubCode::ICCallBreakpointEntryPoint());
+        break;
+      }
       case PcDescriptors::kClosureCall: {
         saved_value_ = CodePatcher::GetStaticCallTargetAt(pc_, code);
-        CodePatcher::PatchStaticCallAt(pc_, code,
-                                       StubCode::BreakpointRuntimeEntryPoint());
+        CodePatcher::PatchStaticCallAt(
+            pc_, code, StubCode::ClosureCallBreakpointEntryPoint());
+        break;
+      }
+      case PcDescriptors::kRuntimeCall: {
+        saved_value_ = CodePatcher::GetStaticCallTargetAt(pc_, code);
+        CodePatcher::PatchStaticCallAt(
+            pc_, code, StubCode::RuntimeCallBreakpointEntryPoint());
         break;
       }
       default: