Add a level of indirection to exception handler addresses.

src/arm/macro-assembler-arm.h

Index: src/arm/macro-assembler-arm.h
diff --git a/src/arm/macro-assembler-arm.h b/src/arm/macro-assembler-arm.h
index 8f6803eabc941fd79eb6846a5173f9cb443714d8..56b4bbb89d9805388e49a63f43574dcf837224cb 100644
--- a/src/arm/macro-assembler-arm.h
+++ b/src/arm/macro-assembler-arm.h
@@ -549,9 +549,9 @@ class MacroAssembler: public Assembler {
   // Exception handling
 
   // Push a new try handler and link into try handler chain.
-  // The return address must be passed in register lr.
-  // On exit, r0 contains TOS (code slot).
-  void PushTryHandler(CodeLocation try_location, HandlerType type);
+  void PushTryHandler(CodeLocation try_location,
+                      HandlerType type,
+                      int handler_index);
 
   // Unlink the stack handler on top of the stack from the try handler chain.
   // Must preserve the result register.
@@ -1243,6 +1243,10 @@ 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.
   static int SafepointRegisterStackIndex(int reg_code);
   MemOperand SafepointRegisterSlot(Register reg);