Add testcase for PR 83541.

Ranger now performs this optimzation.

	PR tree-optimization/83541
	gcc/testsuite
	* g++.dg/pr83541.C: New.

gcc/testsuite/g++.dg/pr83541.C

@@ -0,0 +1,17 @@
+// PR tree-optimization/83541
+// { dg-do compile }
+// { dg-options "-O3 -std=c++17 -ffast-math -fdump-tree-evrp"  }
+
+#include <limits>
+
+int test(int x)
+{
+    if(x == std::numeric_limits<int>::max())
+    {
+        return x+1;
+    }
+    return 42;
+}
+
+// { dg-final { scan-tree-dump "return 42"  evrp } }
+// { dg-final { scan-tree-dump-not "return _"  evrp } }