MIPS: Add a level of indirection to exception handler addresses.

src/mips/macro-assembler-mips.h

Index: src/mips/macro-assembler-mips.h
diff --git a/src/mips/macro-assembler-mips.h b/src/mips/macro-assembler-mips.h
index b9bd2f3a91d0339a60e93499c0c77004c6d7ec7f..5ff1c2d97bf2ba73794ceef2191cfdd9be3da2c5 100644
--- a/src/mips/macro-assembler-mips.h
+++ b/src/mips/macro-assembler-mips.h
@@ -843,9 +843,9 @@ 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 ra.
-  // Clobber t0, t1, t2.
-  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.
@@ -1381,6 +1381,10 @@ 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);