MIPS: Add function declarations missing from r18000.

BUG=
R=ulan@chromium.org

Review URL: https://codereview.chromium.org/83423002

Patch from Balazs Kilvady <kilvadyb@homejinni.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@18027 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

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();