Removed obsolete code for ByteFlopCounters allocation

A long time ago, the run-time library was modified to reset and reuse
basic-block state rather than repeatedly allocate and deallocate it.
Consequently, the allocation and deallocation code, including the
CounterMemoryPool class, no longer serves a useful purpose and has
therefore been removed to clean up the code.
Checking in findsrc.h

Looks like I forgot to add lib/byfl/findsrc.h to the repository in
revision 09fa60077eeeb1bf66f2429d4904f79648fd1516.  Oops.