Add source_location test

test/Prompt/ValuePrinter/SourceLocation.C

@@ -0,0 +1,29 @@
+//------------------------------------------------------------------------------
+// CLING - the C++ LLVM-based InterpreterG :)
+//
+// This file is dual-licensed: you can choose to license it under the University
+// of Illinois Open Source License or the GNU Lesser General Public License. See
+// LICENSE.TXT for details.
+
+//------------------------------------------------------------------------------
+// RUN: cat %s | %cling | FileCheck %s
+
+#include <iostream>
+#if __cplusplus >= 202002L
+#include <version>
+#endif
+
+#ifndef __cpp_lib_source_location
+// Hack to prevent failure if __cpp_lib_source_location feature does not exist!
+std::cout << "(std::source_location) ";
+std::cout << "CHECK_SRCLOC:42:std::source_location getsrcloc()\n";
+#else
+#include <source_location>
+std::source_location getsrcloc() {
+#line 42 "CHECK_SRCLOC"
+  return std::source_location::current();
+}
+getsrcloc()
+#endif
+// CHECK: (std::source_location)
+// CHECK: CHECK_SRCLOC:42:std::source_location getsrcloc()