Implement missing heap-intercept function "dh_malloc_usable_size".


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14721 a5019735-40e9-0310-863c-91ae7b9d1cf9
m_compiler.c was added to noinst_HEADERS but should of course
be added to COREGRIND_SOURCES_COMMON. Now fixed.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14722 a5019735-40e9-0310-863c-91ae7b9d1cf9
Minor non-functional cleanups.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14723 a5019735-40e9-0310-863c-91ae7b9d1cf9