[Debugify] Preserve analyses in -check-debugify
The -check-debugify pass should preserve all analyses. Otherwise, it may
invalidate an optional analysis and inadvertently alter codegen.
The test case is reduced from deopt-bundle.ll. The result of opt -O1
on this file would differ when -debugify-each was toggled. That happened
because CheckDebugify failed to preserve GlobalsAA.
Thanks to Davide Italiano for his help chasing this down!