cl/pointsto_fics: eliminate a misleading debug msg

... and sort the white-listed functions alphabetically

reported-by: David Kašpar
cl/pointsto_fics: add __cxa_guard_{acquire,release}

... to the list of ignored functions

reported-by: David Kašpar
cl/gcc: do not warn about nested type declarations

... with CL_DEBUG_GCC_TREE enabled

reported-by: David Kašpar
cl/gcc-adapt: Support for using g++ for debugging added.

'cc1' is still used by default. Use the 'run-test-cc1plus' script for
running g++ with the Code Listener.