MIPS/GCC/test: Implement `-mmicromips' option test

	gcc/testsuite/
	* gcc.target/mips/mips.exp (mips_option_tests): Add
	`-mmicromips' array element.

From-SVN: r242421

gcc/testsuite/ChangeLog

+2016-11-15  Maciej W. Rozycki  <macro@imgtec.com>
+
+	* gcc.target/mips/mips.exp (mips_option_tests): Add
+	`-mmicromips' array element.
+
 2016-11-15  Michael Matz  <matz@suse.de>
 
 	PR missed-optimization/77881

gcc/testsuite/gcc.target/mips/mips.exp

@@ -360,6 +360,19 @@ set mips_option_tests(-mips16) {
     jalr $3
     move $31,$2
 }
+set mips_option_tests(-mmicromips) {
+    move $2,$31
+    bal 1f
+    .set push
+    .set micromips
+    jraddiusp 0
+    .set pop
+    .align 2
+1:
+    ori $3,$31,1
+    jalr $3
+    move $31,$2
+}
 set mips_option_tests(-mpaired-single) {
     .set mips64
     lui $2,0x3f80