[clang][OpenMP] 6.0: Add defaultmap implicit-behavior 'private' (#158712)
Per OpenMP 6.0 specification, section 7.9.9
Argument keywords, page 291, L17
Semantics, page 292, L15-16
The behavior of 'private' should be described in the same manner as that
of 'firstprivate'
15 ... If implicit-behavior is firstprivate, 16 the attribute is a
data-sharing attribute of firstprivate.
Relevant OpenMP 6.0 issues
defaultmap clause new implicit-behavior 'private' should be documented
https://github.com/OpenMP/spec/issues/4571
Issue 4571: Add missing sentence about private to defaultmap
https://github.com/OpenMP/spec/pull/4577
Testing:
Updated 'defaultmap' error message and codegen LIT tests to verify
behavior of 'private' in OpenMP 6.0.
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