[liveedit] reimplement frame restarting.

src/mips/macro-assembler-mips.cc

Index: src/mips/macro-assembler-mips.cc
diff --git a/src/mips/macro-assembler-mips.cc b/src/mips/macro-assembler-mips.cc
index 25413f9a5431b52958ac5cbf19819944fd81dfcb..22a0a099ba263da03f963505c4d0ff43147b4fe2 100644
--- a/src/mips/macro-assembler-mips.cc
+++ b/src/mips/macro-assembler-mips.cc
@@ -3895,6 +3895,15 @@ void MacroAssembler::DebugBreak() {
   Call(ces.GetCode(), RelocInfo::DEBUGGER_STATEMENT);
 }
 
+void MacroAssembler::MaybeDropFrames() {
+  // Check whether we need to drop frames to restart a function on the stack.
+  ExternalReference restart_fp =
+      ExternalReference::debug_restart_fp_address(isolate());
+  li(a1, Operand(restart_fp));
+  lw(a1, MemOperand(a1));
+  Jump(isolate()->builtins()->FrameDropperTrampoline(), RelocInfo::CODE_TARGET,
+       ne, a1, Operand(zero_reg));
+}
 
 // ---------------------------------------------------------------------------
 // Exception handling.