[llvm] [SPIR-V] Fix i8 pointer type for NULL events in OpEnqueueKernel (PR #201125)

[via llvm-commits]

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@@ -2975,27 +2975,41 @@ static bool buildEnqueueKernel(const SPIRV::IncomingCall *Call,
   // 2. Process all arguments which requered preparation.
   // 2.1 Events - use Call arguments, or use dummy nulls in case of absence of
   // events
+
+  // Per SPIR-V spec, OpEnqueueKernel's Wait Events / Ret Event operands
+  // must be pointers to OpTypeDeviceEvent. Build the LLVM TargetExtType
+  // for spirv.DeviceEvent so getOrCreateSPIRVPointerType can register
+  // both the SPIR-V type and the LLVM-side mapping; deriving the pointer
+  // from an opaque LLVM PointerType would lose the pointee and deduce
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idubinov wrote:

I know that this is just copy, but what do you think about move it back or removing it at all?

https://github.com/llvm/llvm-project/pull/201125