Add a level of indirection to exception handler addresses.

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 68a14bb3aaed2ea51bc2502fb2b92486487d1044..6e6bda95ad399487254dbe075dafe44a1de6b9ea 100644
--- a/src/ia32/macro-assembler-ia32.h
+++ b/src/ia32/macro-assembler-ia32.h
@@ -451,9 +451,10 @@ class MacroAssembler: public Assembler {
   // ---------------------------------------------------------------------------
   // Exception handling
 
-  // Push a new try handler and link into try handler chain.  The return
-  // address must be pushed before calling this helper.
-  void PushTryHandler(CodeLocation try_location, HandlerType type);
+  // Push a new try handler and link it into try handler chain.
+  void PushTryHandler(CodeLocation try_location,
+                      HandlerType type,
+                      int handler_index);
 
   // Unlink the stack handler on top of the stack from the try handler chain.
   void PopTryHandler();
@@ -842,6 +843,10 @@ 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);