Remove HFixedArrayBaseLength instruction and replace with regular HLoadNamedField.

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 3e559232737682972527e0800729c30a8d730d1a..8109e8a288e1b7751498ab193222f74f25f924c9 100644
--- a/src/mips/lithium-codegen-mips.cc
+++ b/src/mips/lithium-codegen-mips.cc
@@ -1675,13 +1675,6 @@ void LCodeGen::DoConstantT(LConstantT* instr) {
 }
 
 
-void LCodeGen::DoFixedArrayBaseLength(LFixedArrayBaseLength* instr) {
-  Register result = ToRegister(instr->result());
-  Register array = ToRegister(instr->value());
-  __ lw(result, FieldMemOperand(array, FixedArrayBase::kLengthOffset));
-}
-
-
 void LCodeGen::DoMapEnumLength(LMapEnumLength* instr) {
   Register result = ToRegister(instr->result());
   Register map = ToRegister(instr->value());