[lit] Remove lit's REQUIRES-ANY directive

Summary:
Remove REQUIRES-ANY alias lit directive since it is hardly used and can
be easily implemented using an OR expression using REQUIRES. Fixup
remaining testcases still using REQUIRES-ANY.

Reviewers: probinson, jdenny, gparker42

Reviewed By: gparker42

Subscribers: eugenis, asb, rbar, johnrusso, simoncook, sabuasal, niosHD, delcypher, jrtc27, zzheng, edward-jones, rogfer01, MartinMosbeck, brucehoult, the_o, PkmX, jocewei, lenary, s.egerton, pzheng, sameer.abuasal, apazos, luismarques, cfe-commits, #sanitizers, llvm-commits

Tags: #llvm, #clang, #sanitizers

Differential Revision: https://reviews.llvm.org/D71408