[CIR][CIRGen][Builtin][Neon] Lower neon_vpadd_v and neon_vpaddq_v into llvm intrinsic #960
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Other than functional change reflected in the title. This PR refactored Neon Built in code in clang/lib/CIR/CodeGen/CIRGenBuiltinAArch64.cpp a bit to make it cleaner.
Also changed RUNOption of test file clang/test/CIR/CodeGen/AArch64/neon-arith.c to make test more concise, and easy to compare against OG (to compare, just remove -fclangir from llvm gen part of RUN, and the test should still pass)