Consistently make the bounds check for AccessArgumentsAt explicit.

src/mips/lithium-codegen-mips.cc

Index: src/mips/lithium-codegen-mips.cc
diff --git a/src/mips/lithium-codegen-mips.cc b/src/mips/lithium-codegen-mips.cc
index 6488285c3b16ff4861d3c3b3d8d45524d1ad908a..77d4b9b09665e7f793ffef98394890489778ee60 100644
--- a/src/mips/lithium-codegen-mips.cc
+++ b/src/mips/lithium-codegen-mips.cc
@@ -2612,14 +2612,6 @@ void LCodeGen::DoAccessArgumentsAt(LAccessArgumentsAt* instr) {
   Register length = ToRegister(instr->length());
   Register index = ToRegister(instr->index());
   Register result = ToRegister(instr->result());
-
-  // Bailout index is not a valid argument index. Use unsigned check to get
-  // negative check for free.
-
-  // TODO(plind): Shoud be optimized to do the sub before the DeoptimizeIf(),
-  // as they do in Arm. It will save us an instruction.
-  DeoptimizeIf(ls, instr->environment(), length, Operand(index));
-
   // There are two words between the frame pointer and the last argument.
   // Subtracting from length accounts for one of them, add one more.
   __ subu(length, length, index);