[mlir][acc] Consistency between acc.loop and acc compute ops (#114549)

- GangPrivate and GangFirstPrivate renamed to just Private and
Firstprivate respectively. This is makes compute ops consistent

[mlir][acc] Consistency between acc.loop and acc compute ops (#114549)

- GangPrivate and GangFirstPrivate renamed to just Private and
Firstprivate respectively. This is makes compute ops consistent with the
loop op (and also with the acc spec wording for the clause).
- Added getBody to all compute ops
- Verifier for firstprivate ops / recipes is enabled

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[acc] Improve LegalizeDataValues pass to handle data constructs (#112990)

Renames LegalizeData to LegalizeDataValues since this pass fixes up SSA
values. LegalizeData suggested that it fixed data m

[acc] Improve LegalizeDataValues pass to handle data constructs (#112990)

Renames LegalizeData to LegalizeDataValues since this pass fixes up SSA
values. LegalizeData suggested that it fixed data mapping.

This change also adds support to fix up ssa values for data clause
operations. Effectively, compute regions within a data region use the
ssa values from data operations also. The ssa values within data regions
but not within compute regions are not updated.

This change is to support the requirement in the OpenACC spec which
notes that a visible data clause is not just one on the current compute
construct but on the lexically containing data construct or visible
declare directive.

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