xe: jit: enable kernel debug information

[rjoursler]

Downstreams new nGEN code. In particular downstreams support for DWARF debug information. The basic debug information was originally implemented in #2227, and was further extended to include a line table. The line table is only enabled in DNNL_DEV_MODE to avoid overhead in release builds (potentially this condition should be removed to improve the information collected by profiling tools) and under C++20 builds (due to a dependency on std::source_location.) This line table works with gdb-onapi as can be seen with the following picture:

Sample usage (requires using SYCL gpu runtime for gdb to work):

$ cat env/gdb-oneapi_env.sh
source ~/intel/gdb-oneapi/setvars.sh --force
export ZET_ENABLE_PROGRAM_DEBUGGING=1

for f in /sys/class/drm/card*/prelim_enable_eu_debug; do
    val=$(cat $f)
    if [ $val == 0 ]; then
        sudo sh -c "echo 1 > $f"
    fi
done
$ source env/gdb-oneapi_env.sh

:: initializing oneAPI environment ...
   -bash: BASH_VERSION = 5.1.16(1)-release
   args: Using "$@" for setvars.sh arguments:
:: debugger -- latest
:: oneAPI environment initialized ::
$ gdb-oneapi --args ~/dnnl/build/tests/benchdnn/benchdnn --matmul --engine=gpu 2048x13:13x512
...
(gdb) break _entry
Function "_entry" not defined.
Make breakpoint pending on future shared library load? (y or [n]) y
Breakpoint 1 (_entry) pending.
(gdb) r
...
Thread 2.1414 hit Breakpoint 1, with SIMD lanes [0-15], gemm_kernel ()
    at ~/dnnl/src/gpu/intel/jit/gemm/generator/pieces/common.cxx:42
42          or_(1, cr0, cr0, cr0Enable);
(gdb)

[rjoursler]

make test
disable device_cpu
enable device_gpu

[rjoursler]

make test
disable device_cpu
enable device_gpu