LLVM v21.1.0.rc2

[h-vetinari]

Blockers for merging this PR and thus enabling the compilers in conda-forge (indentation denotes dependency):

• libcxx v21.1.0.rc2 libcxx-feedstock#236
• llvmdev v21.1.0.rc2 llvmdev-feedstock#337
  • clangdev v21.1.0.rc2 clangdev-feedstock#368 (also needs libcxx)
    • Build for LLVM v21.1 rc cctools-and-ld64-feedstock#87 (major-only)
    • compiler-rt v21.1.0.rc2 compiler-rt-feedstock#148
      • openmp v21.1.0.rc2 openmp-feedstock#182
  • lld v21.1.0.rc2 lld-feedstock#131

Clang v21.1 for other platforms (major-only):

• https://github.com/conda-forge/clang-win-activation-feedstock
• https://github.com/conda-forge/ctng-compiler-activation-feedstock
• https://github.com/conda-forge/r_clang_activation-feedstock

Other LLVM-related feedstocks:

• mlir v21.1.0.rc2 mlir-feedstock#104 (needs llvmdev)
  • flang v21.1.0.rc2 flang-feedstock#110 (also needs compiler-rt)
    • flang-rt v21.1.0.rc2 flang-rt-feedstock#3
      • flang-activation v21.1.0.rc2 flang-activation-feedstock#33 (also needs lld)
• https://github.com/conda-forge/libcxx-testing-feedstock (major-only)
• https://github.com/conda-forge/lldb-feedstock (needs this PR)
• https://github.com/conda-forge/mlir-python-bindings-feedstock (needs mlir & this PR)

[conda-forge-admin]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe/meta.yaml) and found it was in an excellent condition.

[conda-forge-admin]

Hi! This is the friendly conda-forge automerge bot!

I considered the following status checks when analyzing this PR:

• linter: passed
• azure: passed

Thus the PR was passing and merged! Have a great day!