[DO NOT MERGE] Update to LLVM18.1.8 #13038

Job	Run time
Windows 10 x64 Release	1h 2m 31s
Windows 10 x86 Release	57m 14s
Upload Event Payload	2s
mac13 ARM64 LLVM_ENABLE_ASSERTIONS=On, builtin_zlib=ON	22m 56s
fedora40 LLVM_ENABLE_ASSERTIONS=On, CMAKE_CXX_STANDARD=20	45m 20s
mac14 X64 LLVM_ENABLE_ASSERTIONS=On, CMAKE_CXX_STANDARD=20	1h 21m 46s
alma8 LLVM_ENABLE_ASSERTIONS=On	36m 55s
mac15 ARM64 LLVM_ENABLE_ASSERTIONS=On, CMAKE_CXX_STANDARD=20	29m 11s
alma9 LLVM_ENABLE_ASSERTIONS=On, CMAKE_BUILD_TYPE=Debug	1h 39m 17s
mac-beta ARM64 LLVM_ENABLE_ASSERTIONS=On, CMAKE_CXX_STANDARD=20	28m 51s
ubuntu20 LLVM_ENABLE_ASSERTIONS=On	58m 43s
ubuntu22 imt=Off, LLVM_ENABLE_ASSERTIONS=On, CMAKE_BUILD_TYPE=Debug	1h 12m 25s
ubuntu2404 LLVM_ENABLE_ASSERTIONS=On, CMAKE_BUILD_TYPE=Debug	1h 25m 47s
debian125 LLVM_ENABLE_ASSERTIONS=On, CMAKE_CXX_STANDARD=20	40m 15s
alma9 modules_off runtime_cxxmodules=Off	52m 15s
alma9 march_native CMAKE_BUILD_TYPE=RelWithDebInfo, CMAKE_CXX_FLAGS=-march=native, CMAKE_C_FLAGS=-march=native, fortran=OFF	50m 56s
alma9 arm64 CMAKE_BUILD_TYPE=RelWithDebInfo, ccache=ON	36m 13s
alma9-clang clang LLVM_ENABLE_ASSERTIONS=On, CMAKE_C_COMPILER=clang, CMAKE_CXX_COMPILER=clang++	50m 38s
ubuntu2404-cuda gpu	33m 16s
	15h 44m 31s

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