[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.

1 files changed, 6 insertions, 1 deletions

diff --git a/clang/lib/AST/ComputeDependence.cpp b/clang/lib/AST/ComputeDependence.cpp
index 5ec3013..bad8e75 100644
--- a/clang/lib/AST/ComputeDependence.cpp
+++ b/clang/lib/AST/ComputeDependence.cpp
@@ -443,12 +443,17 @@ ExprDependence clang::computeDependence(ObjCIndirectCopyRestoreExpr *E) {
   return E->getSubExpr()->getDependence();
 }
 
-ExprDependence clang::computeDependence(OMPArraySectionExpr *E) {
+ExprDependence clang::computeDependence(ArraySectionExpr *E) {
   auto D = E->getBase()->getDependence();
   if (auto *LB = E->getLowerBound())
     D |= LB->getDependence();
   if (auto *Len = E->getLength())
     D |= Len->getDependence();
+
+  if (E->isOMPArraySection()) {
+    if (auto *Stride = E->getStride())
+      D |= Stride->getDependence();
+  }
   return D;
 }