[OpenMP] Improve LIT tests on composite target constructs

[OpenMP] Improve LIT tests on composite target constructs

This commit improves the "target_teams_distribute_paralle
l_for_simd_codegen.cpp" and "target_teams_distribute_redu
ction_codegen.cpp" tests based upon some of the execution
tests present in the SOLLVE tests. Based on SOLLVE, a new
test "target_task_affinity_codegen.cpp" is also being
added. These tests are required to be added because the
existing tests do not test the combination of directives
these will be testing.

Link to SOLLVE page: https://github.com/SOLLVE/sollve_vv

Differential Revision: https://reviews.llvm.org/D144544