RTEMS | cpukit/libcsupport: Implement malloc_usable_size (!591)

[Jeremy Lorelli (@jjl77)]

Jeremy Lorelli commented on a discussion on testsuites/libtests/malloctest/init.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/591#note_126927

 > +
 > +  p1 = malloc(120);
 > +  rtems_test_assert( p1 != NULL );
 > +  rtems_test_assert( errno == -1 );
 > +
 > +  sz1 = malloc_usable_size( p1 );
 > +  rtems_test_assert( sz1 != 0 );
 > +  rtems_test_assert( sz1 >= 120 );
 > +
 > +  p2 = malloc( 500 );
 > +  rtems_test_assert( p2 != NULL );
 > +  rtems_test_assert( errno == -1 );
 > +
 > +  sz2 = malloc_usable_size( p1 );
 > +  rtems_test_assert( sz2 != 0 );
 > +  rtems_test_assert( sz1 >= sz2 );

I've revised the test to remove this assumption

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/591#note_126927
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