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Switch GitHub Actions to Ubuntu 26.04 and enable control-flow coverage. - #2270
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Also fix compatibility issues exposed by newer GCC and Clang versions on Ubuntu 26.04: - Bump `abseil-cpp` to `20260817.0` (in `MODULE.bazel`, `MODULE.bazel.lock`, and `cmake/BuildDependencies.cmake`) to pick up the `<bmi2intrin.h>` -> `<immintrin.h>` fix in `raw_hash_set.h` needed when GCC 15 targets `x86-64-v3` (`__BMI2__`) by default. - Avoid `std::atomic<bool>` and `std::copy` in SanitizerCoverage tracing hooks (`ExecutionCoverage` and `TableOfRecentlyComparedBuffers::Insert`), using `__atomic_load_n`, `__atomic_store_n`, and `__builtin_memcpy` instead to prevent infinite recursion when unoptimized builds link instrumented COMDAT symbols with `_GLIBCXX_ASSERTIONS` enabled by default in `libstdc++` 15, and include `meta.h` directly in `table_of_recent_compares.h`. - Move `GetTypeName()` into `type_support_internal` so `PRETTY_FUNCTION` fits within GCC's 80-character `std::string_view` compile-time debug printing limit and preserves the `fuzztest::internal::` namespace prefix. - Avoid calling `std::memcpy` with a null `out.data()` pointer on empty byte vectors in `IRObject::ToCorpus`, preventing Clang from optimizing away the empty-vector branch via `memcpy`'s `nonnull` attribute. PiperOrigin-RevId: 1004136793
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Switch GitHub Actions to Ubuntu 26.04 and enable control-flow coverage.
Also fix compatibility issues exposed by newer GCC and Clang versions on Ubuntu 26.04:
abseil-cppto20260817.0(inMODULE.bazel,MODULE.bazel.lock, andcmake/BuildDependencies.cmake) to pick up the<bmi2intrin.h>-><immintrin.h>fix inraw_hash_set.hneeded when GCC 15 targetsx86-64-v3(__BMI2__) by default.std::atomic<bool>andstd::copyin SanitizerCoverage tracing hooks (ExecutionCoverageandTableOfRecentlyComparedBuffers::Insert), using__atomic_load_n,__atomic_store_n, and__builtin_memcpyinstead to prevent infinite recursion when unoptimized builds link instrumented COMDAT symbols with_GLIBCXX_ASSERTIONSenabled by default inlibstdc++15, and includemeta.hdirectly intable_of_recent_compares.h.GetTypeName()intotype_support_internalsoPRETTY_FUNCTIONfits within GCC's 80-characterstd::string_viewcompile-time debug printing limit and preserves thefuzztest::internal::namespace prefix.std::memcpywith a nullout.data()pointer on empty byte vectors inIRObject::ToCorpus, preventing Clang from optimizing away the empty-vector branch viamemcpy'snonnullattribute.