Remove MIPS support

runtime/vm/regexp_assembler_ir.cc

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/regexp_assembler_ir.h"
 
 #include "vm/bit_vector.h"
 #include "vm/compiler.h"
 #include "vm/dart_entry.h"
 #include "vm/flow_graph_builder.h"
@@ skipping 284 matching lines @@
 }
 
 
 void IRRegExpMacroAssembler::FinalizeRegistersArray() {
   ASSERT(registers_count_ >= saved_registers_count_);
   registers_array_ =
       TypedData::New(kTypedDataInt32ArrayCid, registers_count_, Heap::kOld);
 }
 
 
-#if defined(TARGET_ARCH_ARM64) || defined(TARGET_ARCH_ARM) ||                  \
-    defined(TARGET_ARCH_MIPS)
+#if defined(TARGET_ARCH_ARM64) || defined(TARGET_ARCH_ARM)
 // Disabling unaligned accesses forces the regexp engine to load characters one
 // by one instead of up to 4 at once, along with the associated performance hit.
 // TODO(zerny): Be less conservative about disabling unaligned accesses.
 // For instance, ARMv6 supports unaligned accesses. Once it is enabled here,
 // update LoadCodeUnitsInstr methods for the appropriate architectures.
 static const bool kEnableUnalignedAccesses = false;
 #else
 static const bool kEnableUnalignedAccesses = true;
 #endif
 bool IRRegExpMacroAssembler::CanReadUnaligned() {
@@ skipping 1535 matching lines @@
 
   return Bind(new (Z) LoadCodeUnitsInstr(pattern_val, index_val, characters,
                                          specialization_cid_,
                                          TokenPosition::kNoSource));
 }
 
 
 #undef __
 
 }  // namespace dart