Add a test.pl profile to run new tests under the new SMT backend.

This defaults to running only tests marked with an a specific label,
`new-smt-backend`. For now, no tests have been marked so, so this
new configuration runs zero tests (skips everything).

Author: NlightNFotis

regression/cbmc/CMakeLists.txt

@@ -24,6 +24,14 @@ add_test_pl_profile(
     "CORE"
 )
 
+# If `-I` (include flag) is passed, test.pl will run only the tests matching the label following it.
+add_test_pl_profile(
+  "cbmc-new-smt-backend"
+  "$<TARGET_FILE:cbmc> --incremental-smt2-solver 'z3 --smt2 -in' --slice-formula"
+  "-I;new-smt-backend;-s;new-smt-backend"
+  "CORE"
+)
+
 # solver appears on the PATH in Windows already
 if(NOT "${CMAKE_SYSTEM_NAME}" STREQUAL "Windows")
   set_property(