[mips] Fix ambiguous .md attribute uses

This patch is part of a series that fixes ambiguous attribute
uses in .md files, i.e. cases in which attributes didn't use
<ITER:ATTR> to specify an iterator, and in which <ATTR> could
have different values depending on the iterator chosen.

No behavioural change -- produces the same code as before.

2019-07-16  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* config/mips/micromips.md (*movep<MOVEP1:mode><MOVEP2:mode>):
	Explicitly use <MOVEP1:MODE> for the mode attribute.

From-SVN: r273508

gcc/ChangeLog

+2019-07-16  Richard Sandiford  <richard.sandiford@arm.com>
+
+	* config/mips/micromips.md (*movep<MOVEP1:mode><MOVEP2:mode>):
+	Explicitly use <MOVEP1:MODE> for the mode attribute.
+
 2019-07-16  Jan Hubicka  <hubicka@ucw.cz>
 
 	PR bootstrap/91176

gcc/config/mips/micromips.md

@@ -133,5 +133,5 @@
     return "movep\t%2,%0,%z3,%z1";
 }
   [(set_attr "type" "move")
-   (set_attr "mode" "<MODE>")
+   (set_attr "mode" "<MOVEP1:MODE>")
    (set_attr "can_delay" "no")])