MIPS64: Add turbofan support for mips64.

src/compiler/mips64/linkage-mips64.cc

Index: src/compiler/mips64/linkage-mips64.cc
diff --git a/src/compiler/mips/linkage-mips.cc b/src/compiler/mips64/linkage-mips64.cc
similarity index 94%
copy from src/compiler/mips/linkage-mips.cc
copy to src/compiler/mips64/linkage-mips64.cc
index d4ec1902e169df0aa2bc0b07664b833e7267febf..049ae3c3e19c99801e9262989ddc8d98050cb57a 100644
--- a/src/compiler/mips/linkage-mips.cc
+++ b/src/compiler/mips64/linkage-mips64.cc
@@ -26,10 +26,10 @@ struct MipsLinkageHelperTraits {
            s6.bit() | s7.bit();
   }
   static Register CRegisterParameter(int i) {
-    static Register register_parameters[] = {a0, a1, a2, a3};
+    static Register register_parameters[] = {a0, a1, a2, a3, a4, a5, a6, a7};
     return register_parameters[i];
   }
-  static int CRegisterParametersLength() { return 4; }
+  static int CRegisterParametersLength() { return 8; }
 };