### 1. ElementType deduction for pointer-based array sections
Problem: Pointer-based array sections were previously ignored during
`ElementType` deduction, leading to incorrect assumptions about array
item types.
This often resulted in out-of-bounds access, as seen in the assertion
failure:
```
Assertion `idx < size()' failed.
llvm-project/llvm/include/llvm/ADT/SmallVector.h:292:
reference llvm::SmallVectorTemplateCommon<llvm::Value *>::operatorsize_type
[T = llvm::Value *]
```
Fix: Added a check in clang/lib/CodeGen/CGOpenMPRuntime.cpp to ensure
`ElementType` is correctly detected for cases involving non-contiguous
updates with a base pointer.
Impact: Resolves failures in OpenMP_VV (formerly sollve_vv) and other
offload/clang-OpenMP tests:
All tests under:
https://github.com/OpenMP-Validation-and-Verification/OpenMP_VV/tree/master/tests/5.0/target_update
test_target_update_mapper_from_discontiguous.c
test_target_update_mapper_to_discontiguous.c
test_target_update_to_discontiguous.c
test_target_update_from_discontiguous.c
### 2. Zero-dimension propagation in struct member mappings
Problem: A zero-dimension entry for struct members introduced
inconsistencies in complex mapping logic within OMPIRBuilder.cpp.
Placeholder zeros propagated to emitNonContiguousDescriptor(), breaking
reverse indexing logic and corrupting IR:
Loops assume `Dims[I] >= 1`. When `Dims[I] == 0`:
Reverse indexing still stores pointers to uninitialized allocas or
mismatched slots. Runtime interprets `ArgSizes[I]` (derived from
`Dims[I])` as dimensionality, causing size/offset calculations to
collapse to zero → results in `size=0` async copy and plugin interface
errors.
Fix: Prepend a synthetic dimension of size 1 instead of appending a
zero, preserving correctness in `targetDataUpdate()` for non-contiguous
updates.
Impact: Added dedicated test cases that previously failed on main.
230b437d05