[DebugInfo][InstrRef][NFC] "Final" x86 test cleanup

These are some final test changes for using instruction referencing on X86:
 * Most of these tests just have the flag switched so that they run with
   instr-ref, and just work: these tests were fixed by earlier patches.
 * There are some spurious differences in textual outputs,
 * A few have different temporary labels in the output because more
   MCSymbols are printed to the output.

Differential Revision: https://reviews.llvm.org/D114588