[mlir][acc] Add ACCImplicitData pass for implicit data attributes (#166472)

This change adds the ACCImplicitData pass which implements the OpenACC
specification for "Variables with Implicitly Determined Data Attributes"
(OpenACC 3.4 spec, section 2.6.2).

The pass automatically generates data clause operations (copyin,
copyout, present, firstprivate, etc.) for variables used within OpenACC
compute constructs (parallel, kernels, serial) that do not already have
explicit data clauses.

Key features:
- Respects default(none) and default(present) clauses
- Handles scalar vs. aggregate variables with different semantics:
  * Aggregates: present clause (if default(present)) or copy clause
  * Scalars: copy clause (kernels) or firstprivate (parallel/serial)
- Generates privatization recipes when needed for firstprivate clauses
- Performs alias analysis to avoid redundant data mappings
- Ensures proper data clause ordering for partial entity access
- Generates exit operations (copyout, delete) to match entry operations

Requirements:
- Types must implement acc::MappableType and/or acc::PointerLikeType
interfaces to be considered candidates.
- Operations accessing partial entities or creating subviews should
implement acc::PartialEntityAccess and/or mlir::ViewLikeOpInterface for
proper clause ordering.
- Optionally pre-register acc::OpenACCSupport and mlir::AliasAnalysis if
custom alias analysis, variable name determination, or error reporting
is needed.

0 files changed, 0 insertions, 0 deletions