[SPIR-V] SPV_EXT_descriptor_heap Counter operation on directly-cast heap buffer hits wrong fatal error

[jzakharovnv]

Description

isDescriptorHeapCounterUnsupported (SpirvEmitter.cpp) only recognizes heap-sourced objects via the alias map. A direct-cast form such as ((RWStructuredBuffer<uint>)ResourceDescriptorHeap[i]).IncrementCounter() has no alias-map entry, so the check returns false and the call falls through to an unrelated fatal "array of buffers in a struct" error instead of the intended unsupported-counter diagnostic.

Fix

Replace the alias-map check with spirvOptions.useDescriptorHeap && isHeapSourcedValue(object->IgnoreParenCasts()) so both direct accesses and recorded aliases receive the correct diagnostic.

References

• #8518, Copilot review comment