MIPS: Allow specifying base offset when constructing Keyed hydrogen instructions.

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 7c52d8182e28a3b33382e0bc281daa5a8ab55a31..0657fad92fd010f9bffd5ccd609780e5d8abc554 100644
--- a/src/mips/lithium-codegen-mips.h
+++ b/src/mips/lithium-codegen-mips.h
@@ -132,8 +132,7 @@ class LCodeGen: public LCodeGenBase {
                                  int constant_key,
                                  int element_size,
                                  int shift_size,
-                                 int additional_index,
-                                 int additional_offset);
+                                 int base_offset);
 
   // Emit frame translation commands for an environment.
   void WriteTranslation(LEnvironment* environment, Translation* translation);