[committed] MIPS/GAS: Use local `isa' consistently in `is_opcode_valid'

[Maciej W. Rozycki]

Replace a global `mips_opts.isa' reference in `is_opcode_valid' and use 
a local copy just made in `isa'.  No functional change.

	gas/
	* config/tc-mips.c (is_opcode_valid): Use local `isa' 
	consistently.
---
binutils-mips-gas-is-opcode-isa.diff
Index: binutils/gas/config/tc-mips.c
===================================================================
--- binutils.orig/gas/config/tc-mips.c	2016-11-24 23:13:38.868941879 +0000
+++ binutils/gas/config/tc-mips.c	2016-11-25 00:00:49.779749494 +0000
@@ -3217,7 +3248,7 @@ is_opcode_valid (const struct mips_opcod
   int fp_s, fp_d;
   unsigned int i;
 
-  if (ISA_HAS_64BIT_REGS (mips_opts.isa))
+  if (ISA_HAS_64BIT_REGS (isa))
     for (i = 0; i < ARRAY_SIZE (mips_ases); i++)
       if ((ase & mips_ases[i].flags) == mips_ases[i].flags)
 	ase |= mips_ases[i].flags64;