[liveedit] reimplement frame restarting.

src/mips64/macro-assembler-mips64.cc

Index: src/mips64/macro-assembler-mips64.cc
diff --git a/src/mips64/macro-assembler-mips64.cc b/src/mips64/macro-assembler-mips64.cc
index 480bae10f331611a9d912b3c9d2e0904ffae43aa..1f62b1be0100b6ea26cd88e2b6158840c7c1e54b 100644
--- a/src/mips64/macro-assembler-mips64.cc
+++ b/src/mips64/macro-assembler-mips64.cc
@@ -4050,6 +4050,15 @@ 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));
+  ld(a1, MemOperand(a1));
+  Jump(isolate()->builtins()->FrameDropperTrampoline(), RelocInfo::CODE_TARGET,
+       ne, a1, Operand(zero_reg));
+}
 
 // ---------------------------------------------------------------------------
 // Exception handling.