Some small updates in tccdbg.c found by checking readelf output from
gcc/clang.
- Change encoding type bool type
- Fix enum signed/unsigned
- Do not hash anon symbol
- Use correct filename/line_number for global variables
- Fix compiler warning in tcc_get_dwarf_info
- Use unsigned long long for array indexes
- Display correct first line of function in gdb
Better avoid global variables, at least in new code.
tccdbg.c hopefully should be logically identical to the
former parts in tccgen/elf.c (s1 tccstate added in some
places)
tccelf.c: dwarf linkage seems special per dwarf rather
than special per target.
