fa75220ac5 ci: Use clang-18 in asan/fuzz/tsan task (MarcoFalke)
fad23a0646 ci: Bump clang+llvm in i686_multiprocess task (MarcoFalke)
Pull request description:
Use clang-18, which comes with bugfixes and sanitizer upgrades.
ACKs for top commit:
fanquake:
ACK fa75220ac5
Tree-SHA512: da251eb55d3a7e537110b03fb0fc10fc6e2f4406d55bdb33bdc91459daabfd3b8d1d20859a66718bb1b09126e11495f6584c52504a85eb09bde9eafafdaf0b0b