[RFC][debuginfo-test] Rename debug-info lit tests for general purposes

Discussion thread:

Move debuginfo-test into a subdirectory of a new top-level directory,
called cross-project-tests. The new name replaces "debuginfo-test" as an
LLVM project enabled via LLVM_ENABLE_PROJECTS.

Differential Revision: https://reviews.llvm.org/D95339

Reviewed by: aprantl

GitOrigin-RevId: 1364750dadbb56032ef73b4d0d8cbc88a51392da
224 files changed
tree: 4b825dc642cb6eb9a060e54bf8d69288fbee4904

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