[Flang][OpenMP][NFC] Track Objects for BlockArgs (#197442) When lowering a BlockArg in OpenMP, currently the symbol is tracked. This can however cause issues later on down the line as information may be lost relating to an expression. For example, an ArrayElement will be represented by its symbol, in this case the full array. This is not ideal as its just he ArrayElement that is intended to be represented. Now, the object is tracked instead of the Symbol. For cases where the symbol is required, appropriate API is available to retrieve this information. This change opens the ability to better handle lowering of expressions such as Array Elements. Assisted-by: Codex
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