mips64: fix 'unused variable' warning

On a couple of places, the code expected either _MIPSEB or _MIPSEL flag to
use some variables, but none of these flags is set when the code is compiled
for non-MIPS architectures.


git-svn-id: svn://svn.valgrind.org/vex/trunk@2726 8f6e269a-dfd6-0310-a8e1-e2731360e62c
diff --git a/priv/guest_mips_toIR.c b/priv/guest_mips_toIR.c
index a379367..551faee 100644
--- a/priv/guest_mips_toIR.c
+++ b/priv/guest_mips_toIR.c
@@ -3862,7 +3862,7 @@
       store(binop(Iop_Sub64, mkexpr(t1), mkexpr(B_pos)), mkexpr(B_byte));
       store(mkexpr(t1), mkexpr(A_byte));
 
-#elif defined (_MIPSEB)
+#else /* _MIPSEB */
       /* Calculate X_byte position. */
       assign(B_pos, IRExpr_ITE(binop(Iop_CmpEQ64, mkexpr(t3), mkU64(0x7)),
                                mkU64(0x0),
@@ -3986,7 +3986,7 @@
       store(binop(Iop_Add64, mkexpr(t1), mkexpr(G_pos)), mkexpr(G_byte));
       store(mkexpr(t1), mkexpr(H_byte));
 
-#elif defined (_MIPSEB)
+#else /* _MIPSEB */
       /* Calculate X_byte position. */
       assign(B_pos, IRExpr_ITE(binop(Iop_CmpLT64U, mkU64(0x5), mkexpr(t3)),
                                mkU64(0x6),
@@ -4084,7 +4084,7 @@
          store(binop(Iop_Sub64, mkexpr(t1), mkexpr(F_pos)), mkexpr(F_byte));
          store(mkexpr(t1), mkexpr(E_byte));
 
-#elif defined (_MIPSEB)
+#else    /* _MIPSEB */
          /* Calculate X_byte position. */
          assign(F_pos, IRExpr_ITE(binop(Iop_CmpEQ64, mkexpr(t3), mkU64(0x3)),
                                   mkU64(0x0),
@@ -4145,7 +4145,7 @@
          store(binop(Iop_Sub32, mkexpr(t1), mkexpr(F_pos)), mkexpr(F_byte));
          store(mkexpr(t1), mkexpr(E_byte));
 
-#elif defined (_MIPSEB)
+#else    /* _MIPSEB */
          /* Calculate X_byte position. */
          assign(F_pos, IRExpr_ITE(binop(Iop_CmpEQ32, mkexpr(t3), mkU32(0x3)),
                                   mkU32(0x0),
@@ -4211,7 +4211,7 @@
          store(binop(Iop_Add64, mkexpr(t1), mkexpr(G_pos)), mkexpr(G_byte));
          store(mkexpr(t1), mkexpr(H_byte));
 
-#elif defined (_MIPSEB)
+#else    /* _MIPSEB */
          /* Calculate X_byte position. */
          assign(F_pos, IRExpr_ITE(binop(Iop_CmpEQ64, mkexpr(t3), mkU64(0x3)),
                                   mkU64(0x1),
@@ -4272,7 +4272,7 @@
          store(binop(Iop_Add32, mkexpr(t1), mkexpr(G_pos)), mkexpr(G_byte));
          store(mkexpr(t1), mkexpr(H_byte));
 
-#elif defined (_MIPSEB)
+#else    /* _MIPSEB */
          /* Calculate X_byte position. */
          assign(F_pos, IRExpr_ITE(binop(Iop_CmpEQ32, mkexpr(t3), mkU32(0x3)),
                                   mkU32(0x1),