[Interpreter] No longer require context machine register in bytecode handlers

src/mips/builtins-mips.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_MIPS
 
 #include "src/codegen.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 1117 matching lines @@
 
 
 static void Generate_EnterBytecodeDispatch(MacroAssembler* masm) {
   // Initialize register file register and dispatch table register.
   __ Addu(kInterpreterRegisterFileRegister, fp,
           Operand(InterpreterFrameConstants::kRegisterFilePointerFromFp));
   __ li(kInterpreterDispatchTableRegister,
         Operand(ExternalReference::interpreter_dispatch_table_address(
             masm->isolate())));
 
-  // Get the context from the frame.
-  __ lw(kContextRegister,
-        MemOperand(kInterpreterRegisterFileRegister,
-                   InterpreterFrameConstants::kContextFromRegisterPointer));
-
   // Get the bytecode array pointer from the frame.
   __ lw(
       kInterpreterBytecodeArrayRegister,
       MemOperand(kInterpreterRegisterFileRegister,
                  InterpreterFrameConstants::kBytecodeArrayFromRegisterPointer));
 
   if (FLAG_debug_code) {
     // Check function data field is actually a BytecodeArray object.
     __ SmiTst(kInterpreterBytecodeArrayRegister, at);
     __ Assert(ne, kFunctionDataShouldBeBytecodeArrayOnInterpreterEntry, at,
@@ skipping 1551 matching lines @@
   }
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS