[llvm] [SPIR-V] Add llvm.loop.unroll metadata lowering (PR #132062)

[Dmitry Sidorov via llvm-commits]

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@@ -175,6 +175,8 @@ llvm::SplitKnownCriticalEdge(Instruction *TI, unsigned SuccNum,
   // Create our unconditional branch.
   BranchInst *NewBI = BranchInst::Create(DestBB, NewBB);
   NewBI->setDebugLoc(TI->getDebugLoc());
+  if (auto *LoopMD = TI->getMetadata(LLVMContext::MD_loop))
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MrSidims wrote:

Ideally it should go into a separate PR, but the issue of not copying llvm.loop is being exposed on during a call to reg2mem pass, which (if I understood correctly) is in semi-deprecated state and it's not trivial to test it.

https://github.com/llvm/llvm-project/pull/132062