[SPIR-V] SPV_EXT_descriptor_heap RasterizerOrdered flag lost on heap buffer alias re-derivation, suppressing ROV interlock

[jzakharovnv]

Description

When a heap buffer alias pointer is re-derived in emitDescriptorHeapBufferPointer (SpirvEmitter.cpp), the new SpirvInstruction does not copy the RasterizerOrdered flag set on the original pointer in emitDescriptorHeapBufferAccess. Accesses through a local RasterizerOrderedStructuredBuffer or RasterizerOrderedByteAddressBuffer alias therefore do not cause SpirvBuilder to emit the required begin/end invocation interlock. This is a silent correctness bug.

Fix

Add bufferDataPtr->setRasterizerOrdered(isRasterizerOrderedView(decl->getType())) after restoring the storage class and layout rule on the re-derived pointer.

References

• #8517, Copilot review comment