Check avx2_available in check_avx2_available

check_avx2_available should check avx2_available, instead of avx_available.
Otherwise, check_avx2_available may use result from check_avx_available.

	PR testsuite/89907
	* lib/target-supports.exp (check_avx2_available): Replace
	avx_available with avx2_available.

From-SVN: r270066

gcc/testsuite/ChangeLog

+2019-04-01  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR testsuite/89907
+	* lib/target-supports.exp (check_avx2_available): Replace
+	avx_available with avx2_available.
+
 2019-04-01  Andrey Belevantsev  <abel@ispras.ru>
 
 	PR rtl-optimization/85412

gcc/testsuite/lib/target-supports.exp

@@ -7403,7 +7403,7 @@ proc check_avx_available { } {
 # Return true if we are compiling for AVX2 target.
 
 proc check_avx2_available { } {
-  if { [check_no_compiler_messages avx_available assembly {
+  if { [check_no_compiler_messages avx2_available assembly {
     #ifndef __AVX2__
     #error unsupported
     #endif