llvm: Update to 18.1.8
Brings following fixes
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3b5b5c1ec4a3 [libcxx] Align `__recommend() + 1` by __endian_factor (#90292)
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72c9425a79fd [libc++][NFC] Rewrite function call on two lines for clarity (#79141)
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443e23eed24d Bump version to 18.1.8 (#95458)
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768118d1ad38 [clang-format] Fix a bug in formatting goto labels in macros (#92494)
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8c0fe0d65ed8 release/18.x: [clang-format] Don't always break before << between str… (#94091)
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7e6ece9b4f2d [PPCMergeStringPool] Only replace constant once (#92996)
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1ce2d26cd2e9 Bump version to 18.1.7 (#93723)
Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>