[clang] [llvm] [Offload] Change ELF machine type for SPIR-V OpenMP image (PR #159623)

[Nick Sarnie via llvm-commits]

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@@ -423,9 +423,10 @@ Error offloading::intel::containerizeOpenMPSPIRVImage(
   Header.Class = ELF::ELFCLASS64;
   Header.Data = ELF::ELFDATA2LSB;
   Header.Type = ELF::ET_DYN;
-  // Use an existing Intel machine type as there is not one specifically for
-  // Intel GPUs.
-  Header.Machine = ELF::EM_IA_64;
+  // Use a fake machine type as there is not one specifically for
+  // Intel GPUs, the associated runtime plugin is looking for
+  // this value.
+  Header.Machine = 0x8086;
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sarnex wrote:

I was worried we'd have to officially add it to ELF spec as per [this](https://gabi.xinuos.com/elf/a-emachine.html) link and then update all userspace tools, if you're okay with us only changing the LLVM ELF tools I'd be happy to do that

https://github.com/llvm/llvm-project/pull/159623