Add UEFI target support - #696
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What changed
lld-linktoolchains, PE/COFF linker flags, and MSVC feature overridesWhy
Downstream users currently need local patches to produce freestanding EFI applications. The existing toolchain graph did not expose UEFI platforms or a complete Clang-to-
lld-linkpath, and Windows-oriented defaults such as PIC are invalid for this ABI.This adds the missing target configuration without changing existing Linux, macOS, or Windows toolchains.
Validation
stage1_from_source