llvm/clang: Upgrade to 21.1.3 release

llvm/clang: Upgrade to 21.1.3 release

brings following fixes

* 450f52eec88f Bump version to 21.1.3.
* 05b5090e961f Port 5b4819e to release/21.x
* 2cb08dbb39b1 [compiler-rt][sanitizer] fix msghdr for musl (#136195)
* 6e687cbe0dd3 [SPARC] Prevent meta instructions from being inserted into delay slots (#161111)
* f8151a1d2c86 [clang] [Headers] Don't use unreserved names in avx10_2bf16intrin.h (#161824)
* 9ee4ac8a8359 [clang][SPARC] Pass 16-aligned structs with the correct alignment in CC (#155829)
* 220bac16a417 [Hexagon] Add opcode V6_vS32Ub_npred_ai for offset validity check (#161618)
* a867bd53e861 [clang][PAC] Don't try to diagnose use of pointer auth on dependent types #159505 (#159859)
* 41e817a1d1f4 release/21.x: [clang-format] Fix bugs in annotating arrows and square brackets (#160973)
* 559d966bcb54 [Mips] Fix atomic min/max generate mips4 instructions when compiling for mips2 (#159717)
* d1e2f8916128 [LLD] [COFF] Fix symbol names for import thunks (#160694)
* 0060034c6a0b [analyzer] Revert #115918, so empty base class optimization works again (#157480)
* 31e4363ba9c2 [NVPTX] Disable relative lookup tables (#159748)
* 74cb34a6f51a Bump version to 21.1.3

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>