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ARROW-16881: [Gandiva][C++] Fix castINTERVALYEAR implementation (#13421)

Fix error in LLVM where didn't find these two functions.

Fix regex to allow negative digits for Interval Year.

Authored-by: Johnnathan <johnnathanalmeida@gmail.com>
Signed-off-by: Pindikura Ravindra <ravindra@dremio.com>