Surelog (library) leaks memory.

[mglb]

Surelog, at least when used as a library, has significant memory leaks.
First discovered in systemverilog-plugin, but later verified with basic Surelog examples (e.g. hellouhdm).
Brief look at logs tells that leaking memory is being allocated in both Surelog and UHDM.

Build

# export CXX='clang++'
# cmake \
    -DCMAKE_BUILD_TYPE=Release \
    -DCMAKE_POSITION_INDEPENDENT_CODE=ON \
    -DCMAKE_CXX_FLAGS="-gdwarf-4" \
    -S . -B build
# cmake --build build -j $(nproc)

(-DCMAKE_CXX_FLAGS="-gdwarf-4" is for Valgrind compatibility when compiling with Clang 15+)

Run

# cd build/bin
# valgrind ./hellouhdm ../../tests/UnitElabBlock/top.v

Result:

...
==2== HEAP SUMMARY:
==2==     in use at exit: 6,839,877 bytes in 94,007 blocks
==2==   total heap usage: 1,443,800 allocs, 1,349,793 frees, 98,733,639 bytes allocated
==2==
==2== LEAK SUMMARY:
==2==    definitely lost: 66,818 bytes in 276 blocks
==2==    indirectly lost: 401,047 bytes in 2,469 blocks
==2==      possibly lost: 0 bytes in 0 blocks
==2==    still reachable: 6,372,012 bytes in 91,262 blocks
==2==         suppressed: 0 bytes in 0 blocks

Second run, with already generated preprocessing data (slpp_all):

==2== HEAP SUMMARY:
==2==     in use at exit: 4,613,893 bytes in 69,870 blocks
==2==   total heap usage: 206,939 allocs, 137,069 frees, 17,785,433 bytes allocated
==2==
==2== LEAK SUMMARY:
==2==    definitely lost: 68,066 bytes in 275 blocks
==2==    indirectly lost: 399,799 bytes in 2,470 blocks
==2==      possibly lost: 0 bytes in 0 blocks
==2==    still reachable: 4,146,028 bytes in 67,125 blocks
==2==         suppressed: 0 bytes in 0 blocks

[alaindargelas]

Antlr is responsible for most of the leaks.
UHDM memory leaks is going to be solved with the Garbage collection WIP