Use clang-cl assembler in clang-cl toolchain again #272
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This essentially reverts bazelbuild/bazel#23337 now that the toolchain configuration has been moved here. clang-cl does support assembly just like other clang variants and unlike MASM supports assembly using native AT&T syntax as with regular clang. MSVC-style assembly requires using MASM, which continues to be available in the MSVC toolchain.
This has previously been discussed in bazelbuild/bazel#24152 and reverted for Bazel 7.4.1 in bazelbuild/bazel#24211. Ideally, we'd want to have some mechanism to make assembler selection configurable and support several kinds of asm syntax in the future.
CC @meteorcloudy @michaelsiegrist