[llvm] [SPIRV] support for extension SPV_INTEL_maximum_registers (PR #137229)

[Dmitry Sidorov via llvm-commits]

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@@ -532,6 +574,10 @@ void SPIRVAsmPrinter::outputExecutionMode(const Module &M) {
       Inst.addOperand(MCOperand::createImm(TypeCode));
       outputMCInst(Inst);
     }
+    if (MDNode *Node = F.getMetadata("RegisterAllocMode")) {
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MrSidims wrote:

I suggest not to rely on internal to internal https://github.com/intel/llvm metadata. Instead lets use !spirv.ExecutionMode metadata, see https://github.com/KhronosGroup/SPIRV-LLVM-Translator/blob/main/docs/SPIRVRepresentationInLLVM.rst as 'SPIR-V friendly LLVM IR' is also used in SPIR-V backend.

https://github.com/llvm/llvm-project/pull/137229