gprofng: read Dwarf 5

gprofng: read Dwarf 5

gprofng reads Dwarf to find function names, sources, and line numbers.
gprofng skips other debug information.
I fixed three places in gprofng Dwarf reader:
 - parsing the compilation unit header.
 - parsing the line number table header.
 - parsing new DW_FORMs.

Tested on aarch64-linux/x86_64-linux.

gprofng/ChangeLog
2023-03-05  Vladimir Mezentsev  <vladimir.mezentsev@oracle.com>

	PR gprofng/30195
	gprofng/src/Dwarf.cc: Support Dwarf-5.
	gprofng/src/DwarfLib.cc: Likewise.
	gprofng/src/Dwarf.h: Likewise.
	gprofng/src/DwarfLib.h: Likewise.
	gprofng/src/collctrl.cc: Don't read freed memory.