Extract hardcoded error strings into a single place and replace them with enum.

src/mips/lithium-codegen-mips.h

Index: src/mips/lithium-codegen-mips.h
diff --git a/src/mips/lithium-codegen-mips.h b/src/mips/lithium-codegen-mips.h
index a485b67db9496aed6e3c5dbc31e73dc5153d52cf..a328b03ba96564340176bdb3886b6613e4fb58bd 100644
--- a/src/mips/lithium-codegen-mips.h
+++ b/src/mips/lithium-codegen-mips.h
@@ -213,7 +213,7 @@ class LCodeGen BASE_EMBEDDED {
 
   int GetStackSlotCount() const { return chunk()->spill_slot_count(); }
 
-  void Abort(const char* reason);
+  void Abort(BailoutReason reason);
   void FPRINTF_CHECKING Comment(const char* format, ...);
 
   void AddDeferredCode(LDeferredCode* code) { deferred_.Add(code, zone()); }