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When an outlined function is generated for omp target region, a corresponding DISubprogram was not being generated. This resulted in all the debug information for the target region being dropped. This commit adds DISubprogram for the outlined function if there is one available for the parent function. It also updates the current debug location so that the right scope is used for the entries in the outlined function. There are places in the OpenMPIRBuilder which changes insertion point but don't update the debug location accordingly. They cause issue when debug info is enabled. I have fixed a few that I observed to cause issue. But there may be more and a systematic cleanup may be required. With this change in place, I can set source line breakpoint in target region and run to them in debugger.