[clang] Propagate definition data to all redecls (#170090)
Fix the propagation added in commit 0d490ae55f to include all redecls,
not only previous ones. This fixes another instance of the assertion
"Cannot get layout of forward declarations" in getASTRecordLayout().
Kudos to Alexander Kornienko for providing an initial version of the
reproducer that I further simplified.
Fixes #170084
