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[cross-project-tests] Make clang optional if not in LLVM_ENABLE_PROJECTS

Authored by jhenderson on Feb 9 2021, 7:19 AM.

Description

[cross-project-tests] Make clang optional if not in LLVM_ENABLE_PROJECTS

Also mark debuginfo_tests as UNSUPPORTED if clang can't be found and
remove it from the list of test dependencies if not in
LLVM_ENABLE_PROJECTS.

Differential Revision: https://reviews.llvm.org/D96511

Reviewed by: aprantl