MIPS: Remove dead code for inline string hashing.

src/mips64/code-stubs-mips64.h

Index: src/mips64/code-stubs-mips64.h
diff --git a/src/mips64/code-stubs-mips64.h b/src/mips64/code-stubs-mips64.h
index 87ebdd6fdc2abbb4256c10853225d652a195fc81..fc93f415609cf14a23aa30b9d6d915286fc19ed4 100644
--- a/src/mips64/code-stubs-mips64.h
+++ b/src/mips64/code-stubs-mips64.h
@@ -28,18 +28,6 @@ class StringHelper : public AllStatic {
                                      Register scratch,
                                      String::Encoding encoding);
 
-  // Generate string hash.
-  static void GenerateHashInit(MacroAssembler* masm,
-                               Register hash,
-                               Register character);
-
-  static void GenerateHashAddCharacter(MacroAssembler* masm,
-                                       Register hash,
-                                       Register character);
-
-  static void GenerateHashGetHash(MacroAssembler* masm,
-                                  Register hash);
-
   // Compare two flat ASCII strings and returns result in v0.
   static void GenerateCompareFlatAsciiStrings(MacroAssembler* masm,
                                               Register left,