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5763b232e6ci: return to using Ubuntu 22.04 in MSAN jobs (fanquake)d3cbcbf626ci: compile clang and compiler-rt in MSAN jobs (fanquake)796bd1d0d1ci: use LLVM 16.0.4 in MSAN jobs (fanquake)883bc9f561ci: remove extra CC & CXX from MSAN jobs (fanquake)2d4f4b8f29ci: standardize custom libc++ usage in MSAN jobs (fanquake) Pull request description: This reworks the MSAN CIs, to first compile Clang and compiler-rt (using GCC 12), and then, compile an MSAN instrumented libc++ using the just-built Clang 16. This fixes the `native_fuzz_with_msan` job, working around https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1005341, by not using the Debian provided Clang/LLVM. Also included are changes to streamline how we use our "custom libc++", according to upstream: https://releases.llvm.org/16.0.0/projects/libcxx/docs/UsingLibcxx.html#using-a-custom-built-libc, as well as other minor cleanups in the CI configs. An example job is currently running in the qa-assets repo: https://github.com/bitcoin-core/qa-assets/pull/129 (https://cirrus-ci.com/task/4632561431871488). ACKs for top commit: dergoegge: utACK5763b232e6Tree-SHA512: 4f2a6e0b796bb1830b8346dd1e55eaa86a79037b8b4f16a336c1e29f4fc460acca2ecba076635459370bcbb4009333cb79d27ef1521c1fb5db7599cd5bdf558c