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[gn build] Add build files for llvm/lib/Target/ARM + tests

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[gn build] Add build files for llvm/lib/Target/ARM + tests

The ARM target itself is similar to the X86 target in https://reviews.llvm.org/rL348903
The llvm-exegesis unittests ARM bits are similar to the X86 bits in https://reviews.llvm.org/rL350413
Both are similar to the corresponding AArch64 bits in https://reviews.llvm.org/rL350499 too

After this, everything in my local GN branch is upstreamed to LLVM.

Differential Revision: https://reviews.llvm.org/D56371

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