Create heap.inc and use that from the assembler code.
Rename heap related _h... variables to _heap...
Add _heapmaxavail and _heapmemavail functions.
git-svn-id: svn://svn.cc65.org/cc65/trunk@1912 b7a2c559-68d2-44c3-8de9-860c34a00d81
for even faster code. The old _hadd function is now also written in
assembler but does only setup variables and calls the internal function
that is part of free.
git-svn-id: svn://svn.cc65.org/cc65/trunk@182 b7a2c559-68d2-44c3-8de9-860c34a00d81
