Sourabh Singh Tomar d2f1f53043 [flang][OpenMP] Place the insertion point to the start of the block
After skeleton of the `Parallel Op` is created set the insertion point to start of the block. So that later `CodeGen` can proceed.

Note: This patch reflects the work that can be upstreamed from PR(merged)
PR: https://github.com/flang-compiler/f18-llvm-project/pull/424

Reviewed By: schweitz, kiranchandramohan

Differential Revision: https://reviews.llvm.org/D88221
2020-09-25 23:56:41 +05:30
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