[OPENMP] Fix for PR33922: New ident_t flags for

__kmpc_for_static_init().

OpenMP 5.0 will include OpenMP Tools interface that requires distinguishing different worksharing constructs.

Since the same entry point (__kmp_for_static_init(ident_t *loc,
kmp_int32 global_tid,........)) is called in case static
loop/sections/distribute it is suggested using 'flags' field of the
ident_t structure to pass the type of the construct.

llvm-svn: 310865