[dexter] Change line label reference syntax to enable label-relative offsets (2/2) Update dexter tests to use the new line label reference syntax introduced in D101147. Updated with: https://gist.github.com/OCHyams/8255efe7757cac266440ed2ba55f1442 Reviewed By: chrisjackson, jmorse Differential Revision: https://reviews.llvm.org/D101148 GitOrigin-RevId: 98e7911f9517cd9eab0f566ca445096d9e206a75