[PATCH] [mips] [IAS] Add missing constraints and improve testing for the .module directive.

[Daniel Sanders]

LGTM with the CHECK-NOT's added


================
Comment at: test/MC/Mips/module-directive-bad.s:9
@@ +8,3 @@
+    .llvm_internal_mips_reallow_module_directive
+    .module fp=32
+
----------------
You ought to have a CHECK-NOT on each of these to ensure the error doesn't trigger.

http://reviews.llvm.org/D7140

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