[Interpreter] Remove register file register and replace with LoadParentFramePointer.

src/mips64/macro-assembler-mips64.h

Index: src/mips64/macro-assembler-mips64.h
diff --git a/src/mips64/macro-assembler-mips64.h b/src/mips64/macro-assembler-mips64.h
index 47581f3362ba92ef10bd360ed2fd57333cb18e2b..fbb593c754ea5c91fee67acbebeff03990c21284 100644
--- a/src/mips64/macro-assembler-mips64.h
+++ b/src/mips64/macro-assembler-mips64.h
@@ -19,7 +19,6 @@ const Register kReturnRegister2 = {Register::kCode_a0};
 const Register kJSFunctionRegister = {Register::kCode_a1};
 const Register kContextRegister = {Register::kCpRegister};
 const Register kInterpreterAccumulatorRegister = {Register::kCode_v0};
-const Register kInterpreterRegisterFileRegister = {Register::kCode_a7};
 const Register kInterpreterBytecodeOffsetRegister = {Register::kCode_t0};
 const Register kInterpreterBytecodeArrayRegister = {Register::kCode_t1};
 const Register kInterpreterDispatchTableRegister = {Register::kCode_t2};