Move stack unwinding logic into the runtime.

src/ia32/macro-assembler-ia32.h

Index: src/ia32/macro-assembler-ia32.h
diff --git a/src/ia32/macro-assembler-ia32.h b/src/ia32/macro-assembler-ia32.h
index 888fe69b927b9250fae91d9e2a14e6e1f71b920f..2f1354bbf99b87d7af1209e62f4c0954096ba1bc 100644
--- a/src/ia32/macro-assembler-ia32.h
+++ b/src/ia32/macro-assembler-ia32.h
@@ -576,12 +576,6 @@ class MacroAssembler: public Assembler {
   // Unlink the stack handler on top of the stack from the try handler chain.
   void PopTryHandler();
 
-  // Throw to the top handler in the try hander chain.
-  void Throw(Register value);
-
-  // Throw past all JS frames to the top JS entry frame.
-  void ThrowUncatchable(Register value);
-
   // ---------------------------------------------------------------------------
   // Inline caching support
 
@@ -1009,10 +1003,6 @@ class MacroAssembler: public Assembler {
                           Register bitmap_reg,
                           Register mask_reg);
 
-  // Helper for throwing exceptions.  Compute a handler address and jump to
-  // it.  See the implementation for register usage.
-  void JumpToHandlerEntry();
-
   // Compute memory operands for safepoint stack slots.
   Operand SafepointRegisterSlot(Register reg);
   static int SafepointRegisterStackIndex(int reg_code);