[hwasan] fix false positive when hwasan-match-all-tag flag is enabled and short granu...

[hwasan] fix false positive when hwasan-match-all-tag flag is enabled and short granules are used

When hwasan-match-all-tag flag is enabled and short granules are used, at the point checking if this is a short tag case, the tag from pointer is stored in X16 register,
which breaks the assumption that tag from shadow memory is stored in X16 register, this will cause a false positive.

Reviewed By: vitalybuka

Differential Revision: https://reviews.llvm.org/D149252