David Zarzycki eab7cb7d38 [IRGen] NFC: Clean up Alignment type ...

1) Shrink from 4 bytes to 1 byte.
2) Assert that alignments are power-of-two at run time.
3) Assert that alignments are power-of-two at compile time when possible.
4) Eliminate "isZero"/"no alignment" from the type. Use llvm::Optional.

2020-05-26 10:36:33 -04:00

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