aarch64: Add a type attribute to aarch64_movk<mode>

Kyrill pointed out off-list that this new pattern was missing
a type attribute.

2020-02-06  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* config/aarch64/aarch64.md (aarch64_movk<mode>): Add a type
	attribute.

gcc/ChangeLog

+2020-02-06  Richard Sandiford  <richard.sandiford@arm.com>
+
+	* config/aarch64/aarch64.md (aarch64_movk<mode>): Add a type
+	attribute.
+
 2020-02-06  Segher Boessenkool  <segher@kernel.crashing.org>
 
 	* config/rs6000/rs6000.c (rs6000_emit_set_long_const): Handle the case

gcc/config/aarch64/aarch64.md

@@ -1297,6 +1297,7 @@
     operands[3] = gen_int_mode (shift, SImode);
     return "movk\\t%<w>0, #%X2, lsl %3";
   }
+  [(set_attr "type" "mov_imm")]
 )
 
 (define_expand "movti"