Erich Keane 39adc8f423 [NFC] Generalize ArraySections to work for OpenACC in the future (#89639) ...

OpenACC is going to need an array sections implementation that is a
simpler version/more restrictive version of the OpenMP version. 

This patch moves `OMPArraySectionExpr` to `Expr.h` and renames it `ArraySectionExpr`,
 then adds an enum to choose between the two.

This also fixes a couple of 'drive-by' issues that I discovered on the way,
but leaves the OpenACC Sema parts reasonably unimplemented (no semantic
analysis implementation), as that will be a followup patch.

2024-04-25 10:22:03 -07:00

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