[liveedit] reimplement frame restarting.

src/ia32/macro-assembler-ia32.cc

Index: src/ia32/macro-assembler-ia32.cc
diff --git a/src/ia32/macro-assembler-ia32.cc b/src/ia32/macro-assembler-ia32.cc
index 084901783e2ddba1c002483ac23115445bc62a0d..7404a62d5c0805214b84129a521de9c9b97d065f 100644
--- a/src/ia32/macro-assembler-ia32.cc
+++ b/src/ia32/macro-assembler-ia32.cc
@@ -681,6 +681,16 @@ 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());
+  mov(ebx, Operand::StaticVariable(restart_fp));
+  test(ebx, ebx);
+  j(not_zero, isolate()->builtins()->FrameDropperTrampoline(),
+    RelocInfo::CODE_TARGET);
+}
+
 void MacroAssembler::Cvtsi2sd(XMMRegister dst, const Operand& src) {
   xorps(dst, dst);
   cvtsi2sd(dst, src);
@@ -1916,6 +1926,7 @@ void MacroAssembler::InvokePrologue(const ParameterCount& expected,
       DCHECK(actual.reg().is(eax));
       DCHECK(expected.reg().is(ebx));
     } else {
+      definitely_matches = true;
       Move(eax, actual.reg());
     }
   }