MIPS: Add function declarations missing from r18000.

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 c15352fcbee725a49599b2a921b268581b764295..9fbd336b1e63ca6759b070c9e73581a18fb0d722 100644
--- a/src/mips/lithium-codegen-mips.h
+++ b/src/mips/lithium-codegen-mips.h
@@ -186,6 +186,9 @@ class LCodeGen: public LCodeGenBase {
 
   void AddDeferredCode(LDeferredCode* code) { deferred_.Add(code, zone()); }
 
+  void SaveCallerDoubles();
+  void RestoreCallerDoubles();
+
   // Code generation passes.  Returns true if code generation should
   // continue.
   bool GeneratePrologue();