This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project release/19.x llvmorg-19.1.3-0-gab51eccf88f5,
a.k.a. 19.1.3 release.

PR:		280562
MFC after:	1 month

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project release/19.x llvmorg-19.1.0-0-ga4bf6cd7cfb1,
a.k.a. 19.1.0 release.

PR:		280562
MFC after:	1 month

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project release/19.x llvmorg-19.1.0-rc1-0-ga4902a36d5c2.

PR:		280562
MFC after:	1 month

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project main llvmorg-19-init-18630-gf2ccf80136a0, the
last commit before the upstream release/19.x branch was created.

PR:		280562
MFC after:	1 month

  [X86][Driver] Do not add `-evex512` for `-march=native` when the target doesn't support AVX512 (#91694)

This prevents problems with ports that fail to build with
CPUTYPE=native, if the native CPU supports AVX512F, resulting in errors
like:

  /wrkdirs/usr/ports/archivers/libdeflate/work/libdeflate-1.20/lib/x86/adler32_template.h:197:21: error: always_inline function '_mm512_set1_epi8' requires target feature 'evex512', but would be inlined into function 'adler32_x86_avx512_vl512_vnni' that is compiled without support for 'evex512'
    197 |         const vec_t ones = VSET1_8(1);
        |                            ^
  /wrkdirs/usr/ports/archivers/libdeflate/work/libdeflate-1.20/lib/x86/adler32_template.h:116:23: note: expanded from macro 'VSET1_8'
    116 | #  define VSET1_8(a)            _mm512_set1_epi8(a)
        |                                 ^
  /wrkdirs/usr/ports/archivers/libdeflate/work/libdeflate-1.20/lib/x86/adler32_template.h:197:21: error: AVX vector return of type '__m512i' (vector of 8 'long long' values) without 'evex512' enabled changes the ABI
  /wrkdirs/usr/ports/archivers/libdeflate/work/libdeflate-1.20/lib/x86/adler32_template.h:116:23: note: expanded from macro 'VSET1_8'
    116 | #  define VSET1_8(a)            _mm512_set1_epi8(a)
        |                                 ^

Ports known to be affected are: archivers/libdeflate, devel/highway,
www/node20, and lang/rust.

(For rust itself there is also a similar issue reported at
https://github.com/rust-lang/rust/pull/121088).

PR:		276104
Reported by:	netchild
MFC after:	3 days

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project release/18.x llvmorg-18.1.5-0-g617a15a9eac9.

PR:		276104
MFC after:	3 days

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project release/18.x llvmorg-18.1.1-0-gdba2a75e9c7e.

PR:		276104
MFC after:	1 month

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project release/18.x llvmorg-18.1.0-rc2-0-gc6c86965d967.

PR:		276104
MFC after:	1 month

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project main llvmorg-18-init-18359-g93248729cfae, the
last commit before the upstream release/18.x branch was created.

PR:		276104
MFC after:	1 month

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project main llvmorg-18-init-16864-g3b3ee1f53424.

PR:		276104
MFC after:	1 month