PR/54062: Fix the "snprintf_float" test failing after the jemalloc import
issue: jemalloc uses a lot more memory (if it can find it) by default and
this test limited the amount of memory it could get, causing it to get to
an error path with a missing mutex_unlock...

Add noreturn where needed. In the prof case because of cassert() and return
in some functions we disable the cassert() for clang. We should really have
a JEMALLOC_PROF_NORETURN and a way to mark the remaining of the function
unreachable.

fix for shadowing.

branches: 1.1.1;
Initial revision

fix for shadowing.

branches: 1.1.1;
Initial revision