[DO NOT MERGE] Update code base to use LLVM 21#429

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kvpanch wants to merge 18 commits intomainfrom

kvpanch/llvm_21

Commits on Dec 4, 2025

Commits on Dec 6, 2025

properly update llvm submodule to use release/21.x branch
kvpanch
committed
download g++ to use for wasm build instead of mixing gcc and clang++
kvpanch
committed

Commits on Dec 10, 2025

Remove DCOMPILER_RT_BUILD_SANITIZERS from cmake options
kvpanch
committed

Commits on Dec 12, 2025

comment COMPILER_RT_DEFAULT_TARGET_ONLY that seems to cause build issue
kvpanch
committed

Commits on Dec 13, 2025

Commits on Dec 14, 2025