Revert "Revert "Use VersionTuple for parsing versions in Triple, fixing issues...

Revert "Revert "Use VersionTuple for parsing versions in Triple, fixing issues that caused the original change to be reverted. This makes it possible to distinguish between "16" and "16.0" after parsing, which previously was not possible.""

This reverts commit 63a6348c.

Differential Revision: https://reviews.llvm.org/D115254