MIPS/GAS/testsuite: Run the MT ASE test across architectures

Verify that MT ASE instructions assemble and disassemble correctly
across the compatible architectures.
diff --git a/gas/testsuite/gas/mips/mips.exp b/gas/testsuite/gas/mips/mips.exp
index b9580bd..108f6db 100644
--- a/gas/testsuite/gas/mips/mips.exp
+++ b/gas/testsuite/gas/mips/mips.exp
@@ -1492,7 +1492,8 @@
 					    !octeon]
     run_dump_test_arches "mips32-dspr3"	[mips_arch_list_matching mips32r6]
     run_dump_test "mips64-dsp"
-    run_dump_test "mips32-mt"
+    run_dump_test_arches "mips32-mt"	[mips_arch_list_matching mips32r2 \
+						!octeon !micromips]
 
     run_dump_test_arches "save" [lsort -dictionary -unique [concat \
 				[mips_arch_list_matching mips16e-32] \
diff --git a/gas/testsuite/gas/mips/mips32-mt.d b/gas/testsuite/gas/mips/mips32-mt.d
index 80e11f1..ec01879 100644
--- a/gas/testsuite/gas/mips/mips32-mt.d
+++ b/gas/testsuite/gas/mips/mips32-mt.d
@@ -1,6 +1,6 @@
 #objdump: -dr --prefix-addresses --show-raw-insn -M cp0-names=mips32
 #name: MIPS MT ASE for MIPS32
-#as: -mmt -mips32r2 -32
+#as: -mmt -32
 
 # Check MIPS MT ASE for MIPS32 Instruction Assembly