[llvm] [NVPTX] Fix code generation for `trap-unreachable`. (PR #67478)

[Christian Sigg via llvm-commits]

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@@ -3226,14 +3226,9 @@ void SelectionDAGBuilder::visitUnreachable(const UnreachableInst &I) {
 
   // We may be able to ignore unreachable behind a noreturn call.
   if (DAG.getTarget().Options.NoTrapAfterNoreturn) {
-    const BasicBlock &BB = *I.getParent();
-    if (&I != &BB.front()) {
-      BasicBlock::const_iterator PredI =
-        std::prev(BasicBlock::const_iterator(&I));
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chsigg wrote:

The functionality of the new code is the same, it's just much easier to read.

https://github.com/llvm/llvm-project/pull/67478