Enable concurrent sweep on MIPS and ARM64.

runtime/vm/assembler_mips.h

 // Copyright (c) 2013, 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.
 
 #ifndef VM_ASSEMBLER_MIPS_H_
 #define VM_ASSEMBLER_MIPS_H_
 
 #ifndef VM_ASSEMBLER_H_
 #error Do not include assembler_mips.h directly; use assembler.h instead.
 #endif
@@ skipping 645 matching lines @@
   }
 
   void lh(Register rt, const Address& addr) {
     EmitLoadStore(LH, rt, addr);
   }
 
   void lhu(Register rt, const Address& addr) {
     EmitLoadStore(LHU, rt, addr);
   }
 
+  void ll(Register rt, const Address& addr) {
+    EmitLoadStore(LL, rt, addr);
+  }
+
   void lui(Register rt, const Immediate& imm) {
     ASSERT(Utils::IsUint(kImmBits, imm.value()));
     const uint16_t imm_value = static_cast<uint16_t>(imm.value());
     EmitIType(LUI, R0, rt, imm_value);
   }
 
   void lw(Register rt, const Address& addr) {
     EmitLoadStore(LW, rt, addr);
   }
 
@@ skipping 113 matching lines @@
 
   void sb(Register rt, const Address& addr) {
     EmitLoadStore(SB, rt, addr);
   }
 
   void sdc1(DRegister dt, const Address& addr) {
     FRegister ft = static_cast<FRegister>(dt * 2);
     EmitFpuLoadStore(SDC1, ft, addr);
   }
 
+  // rt = 1 on success, 0 on failure

[zra, 2016/02/25 04:02:35]

End comment with '.'

[rmacnak, 2016/02/25 23:31:46]

Done.

+  void sc(Register rt, const Address& addr) {
+    EmitLoadStore(SC, rt, addr);
+  }
+
   void sh(Register rt, const Address& addr) {
     EmitLoadStore(SH, rt, addr);
   }
 
   void sll(Register rd, Register rt, int sa) {
     EmitRType(SPECIAL, R0, rt, rd, sa, SLL);
   }
 
   void sllv(Register rd, Register rt, Register rs) {
     EmitRType(SPECIAL, rs, rt, rd, 0, SLLV);
@@ skipping 943 matching lines @@
                                   Register value,
                                   Label* no_update);
 
   DISALLOW_ALLOCATION();
   DISALLOW_COPY_AND_ASSIGN(Assembler);
 };
 
 }  // namespace dart
 
 #endif  // VM_ASSEMBLER_MIPS_H_