re PR ipa/61159 (__builtin_constant_p gives incorrect results with aliases)

	PR ipa/61159
	* compile/pr61159.c: New testcase

From-SVN: r240082

gcc/testsuite/ChangeLog

 2016-08-09  Jan Hubicka  <hubicka@ucw.cz>
 
+	PR ipa/61159
+	* compile/pr61159.c: New testcase
+
+2016-08-09  Jan Hubicka  <hubicka@ucw.cz>
+
 	PR ipa/64316
 	* gcc.dg/ipa/pr63416.c: New testcase.
 

gcc/testsuite/gcc.c-torture/compile/pr61159.c

+/* { dg-require-alias "" } */
+/* { dg-require-weak "" } */
+
+static int dummy = 0;
+extern int foo __attribute__((__weak__, __alias__("dummy")));
+typedef char check[2*!__builtin_constant_p(dummy)-1];
+typedef char check[2*!__builtin_constant_p(foo)-1];