[MIPS] Remove explicit masks from assembly code

tests/infoleak/test_infoleak_mips.S

 /*
  * Copyright (c) 2013 The Native Client Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
-#include "native_client/pnacl/support/nacl_mips_defs.h"
-
 /*
  * Receives no arguments, just clears registers.
  */
         .text
         .p2align 4
         .set noreorder
         .globl infoleak_clear_state
 infoleak_clear_state:
         mtc1   $zero, $f0
         mtc1   $zero, $f1
         mov.d  $f2,   $f0
         mov.d  $f4,   $f0
-
         mov.d  $f6,   $f0
         mov.d  $f8,   $f0
         mov.d  $f10,  $f0
         mov.d  $f12,  $f0
-
         mov.d  $f14,  $f0
         mov.d  $f16,  $f0
         mov.d  $f18,  $f0
         mov.d  $f20,  $f0
-
         mov.d  $f22,  $f0
         mov.d  $f24,  $f0
         mov.d  $f26,  $f0
         mov.d  $f28,  $f0
-
         mov.d  $f30,  $f0
-        and    $ra, $ra, JUMP_MASK
         jr     $ra
         nop
         .set reorder
 
-
 /*
  * Receives:
  * a0: pointer to float_regs structure
  */
 
         .p2align 4
         .set noreorder
         .globl infoleak_fetch_regs
 infoleak_fetch_regs:
-        and   $a0, $a0, STORE_MASK
-        sdc1  $f0, 0($a0)
-        and   $a0, $a0, STORE_MASK
-        sdc1  $f2, 8($a0)
-
-        and   $a0, $a0, STORE_MASK
-        sdc1  $f4, 16($a0)
-        and   $a0, $a0, STORE_MASK
-        sdc1  $f6, 24($a0)
-
-        and   $a0, $a0, STORE_MASK
-        sdc1  $f8, 32($a0)
-        and   $a0, $a0, STORE_MASK
+        sdc1  $f0,  0($a0)
+        sdc1  $f2,  8($a0)
+        sdc1  $f4,  16($a0)
+        sdc1  $f6,  24($a0)
+        sdc1  $f8,  32($a0)
         sdc1  $f10, 40($a0)
-
-        and   $a0, $a0, STORE_MASK
         sdc1  $f12, 48($a0)
-        and   $a0, $a0, STORE_MASK
         sdc1  $f14, 56($a0)
-
-        and   $a0, $a0, STORE_MASK
         sdc1  $f16, 64($a0)
-        and   $a0, $a0, STORE_MASK
         sdc1  $f18, 72($a0)
-
-        and   $a0, $a0, STORE_MASK
         sdc1  $f20, 80($a0)
-        and   $a0, $a0, STORE_MASK
         sdc1  $f22, 88($a0)
-
-        and   $a0, $a0, STORE_MASK
         sdc1  $f24, 96($a0)
-        and   $a0, $a0, STORE_MASK
         sdc1  $f26, 104($a0)
-
-        and   $a0, $a0, STORE_MASK
         sdc1  $f28, 112($a0)
-        and   $a0, $a0, STORE_MASK
         sdc1  $f30, 120($a0)
-
-        and   $ra, $ra, JUMP_MASK
         jr    $ra
         nop
 
         .set reorder