Simplify jemalloc integration by replacing the three-mechanism approach
(`JEMALLOC_IS_MALLOC` + `JEMALLOC_OVERRIDE___LIBC_*` + linker `--wrap`)
with a cleaner two-step design:
1. Compile jemalloc with `je_` prefix so it only exports `je_malloc`,
`je_free`, etc. (matching what Darwin already does).
2. Define our own `malloc`/`free` in `malloc.cpp` that perform memory
tracking and delegate to `je_malloc`/`je_free`. Provide `__libc_*`
aliases on glibc to intercept internal calls.
Changes:
- Enable `JEMALLOC_PREFIX "je_"` in all non-Darwin `jemalloc_internal_defs.h.in`
- Undef `JEMALLOC_IS_MALLOC` and all `JEMALLOC_OVERRIDE___LIBC_*` defines
- Remove `JEMALLOC_OVERRIDE_MEMALIGN`/`VALLOC`/`PVALLOC` from `jemalloc_defs.h`
- Add `JEMALLOC_NO_RENAME` interface define so consumer code sees `je_*` names
- Prefix all jemalloc API calls (`mallctl` -> `je_mallctl`, etc.) in ClickHouse
- Rewrite `memory.h` to call `je_malloc`/`je_free` directly instead of `__real_*`
- Rewrite `malloc.cpp` with tracking wrappers calling `je_*` underneath
- Rewrite `AllocationInterceptors.h` to map `__real_*` -> `je_*` or `::*`
- Remove `__wrap_*` functions from `AllocationInterceptors.cpp`
- Remove `--wrap` linker flags from `CMakeLists.txt`
- Add jemalloc + clickhouse_common_io deps to `clickhouse_malloc` OBJECT library
- And also fix JEMALLOC_CPREFIX for Darwin, that was the only platform that uses JE_MALLOC_CONF (over MALLOC_CONF)
Co-Authored-By: Claude <[email protected]>
