clang: Upgrade to 20.1.7

clang: Upgrade to 20.1.7

Brings following fixes

* 6146a88f6049 [LoongArch] Fix '-mno-lsx' option not disabling LASX feature (#143821)
* 9ba132be8eea [clan-reply] Backport PTU error recovery to 20.x
* 199e02a36433 Disable clangd/test/module_dependencies.test on Windows
* 02aec86e4d0d [clangd] [Modules] Fix to correctly handle module dependencies (#142828)
* c4f257cb74b5 [llvm-rc] Allow ALT on non-virtkey accelerators (#143374)
* 6fa0cdf3720b release/20.x: [clang] Don't evaluate the initializer of constexpr-unknown parameters. (#142498)
* 337beb73abfe [libc++] Add _LIBCPP_NO_UNIQUE_ADDRESS to flat_{,multi}map::value_compare (#137594)
* b8e10ca59b6a [libc++] Fix check for _LIBCPP_HAS_NO_WIDE_CHARACTERS in features.py (#131675)
* 2da24c36c7df [libcxx] Provide locale conversions to tests through lit substitution (#105651)
* 253e9321c8b6 [release/20.x] Update release notes for SystemZ changes (#140060)
* acf86c5c4dbe [CVP] Keep `ReachableCaseCount` in sync with range of condition (#142302)
* 2481e590eec7 [AArch64][SME] Fix accessing the emergency spill slot with hazard padding (#142190)
* 22a3e6b19409 release/20.x: [AArch64] Handle XAR with v1i64 operand types (#141754)
* e5dd4f129454 [clangd] Guard against trivial FunctionProtoTypeLoc when creating inlay hints (#143087)
* f6532710ace8 [clang-format] Correctly annotate token-pasted function decl names (#142337)
* e0586e278f96 [RelLookupTableConverter] Drop unnamed_addr to avoid generating GOTPCREL relocations (#142304)
* 7759bb57c243 (origin/users/mizvekov/GH139019) [clang] Serialization: support hashing null template arguments
* 7cf14539b644 Bump version to 20.1.7

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>