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

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 bc3e7c48b4a5bd922d455352b294e584c5a98ee6..e679bfa04404c0d17410c04f892c32367a168ff2 100644
--- a/src/mips/macro-assembler-mips.h
+++ b/src/mips/macro-assembler-mips.h
@@ -1286,15 +1286,15 @@ class MacroAssembler: public Assembler {
 
   // Calls Abort(msg) if the condition cc is not satisfied.
   // Use --debug_code to enable.
-  void Assert(Condition cc, const char* msg, Register rs, Operand rt);
+  void Assert(Condition cc, BailoutReason reason, Register rs, Operand rt);
   void AssertRegisterIsRoot(Register reg, Heap::RootListIndex index);
   void AssertFastElements(Register elements);
 
   // Like Assert(), but always enabled.
-  void Check(Condition cc, const char* msg, Register rs, Operand rt);
+  void Check(Condition cc, BailoutReason reason, Register rs, Operand rt);
 
   // Print a message to stdout and abort execution.
-  void Abort(const char* msg);
+  void Abort(BailoutReason msg);
 
   // Verify restrictions about code generated in stubs.
   void set_generating_stub(bool value) { generating_stub_ = value; }
@@ -1378,7 +1378,7 @@ class MacroAssembler: public Assembler {
   // enabled via --debug-code.
   void AssertRootValue(Register src,
                        Heap::RootListIndex root_value_index,
-                       const char* message);
+                       BailoutReason reason);
 
   // ---------------------------------------------------------------------------
   // HeapNumber utilities.