Fix EVA tests for mips64-linux-gnu

[Richard Sandiford]

The EVA test failed on mips64-linux-gnu because of the difference between
o32 and n32 register names.  I fixed it by forcing -32 (as was already in
the micromips .d file) rather than converting it to gpr-names=numeric.

Tested on mips64-linux-gnu.

Richard


gas/testsuite/
	* gas/mips/eva.d: Use -32.

Index: gas/testsuite/gas/mips/eva.d
===================================================================
--- gas/testsuite/gas/mips/eva.d	2013-06-17 23:59:10.000000000 +0100
+++ gas/testsuite/gas/mips/eva.d	2013-06-18 19:00:28.098264291 +0100
@@ -1,6 +1,6 @@
 #objdump: -dr --prefix-addresses --show-raw-insn
 #name: MIPS EVA 
-#as: -meva
+#as: -meva -32
 
 # Test the EVA instructions