[llvm] [AMDGPU] Fix incorrect stepping in gdb for amdgcn.end.cf intrinsic. (PR #83010)

[Matt Arsenault via llvm-commits]

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@@ -336,8 +336,12 @@ bool SIAnnotateControlFlow::closeControlFlow(BasicBlock *BB) {
       // Split edge to make Def dominate Use
       FirstInsertionPt = SplitEdge(DefBB, BB, DT, LI)->getFirstInsertionPt();
     }
-    IRBuilder<>(FirstInsertionPt->getParent(), FirstInsertionPt)
-        .CreateCall(EndCf, {Exec});
+    IRBuilder<> IRB(FirstInsertionPt->getParent(), FirstInsertionPt);
+    // TODO: StructurizeCFG 'Flow' blocks have debug locations from the
+    // condition, for now just avoid copying these DebugLocs so that stepping
+    // out of the then/else block in a debugger doesn't step to the condition.
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arsenm wrote:

Should StructurizeCFG have not preserved these locations then? 

https://github.com/llvm/llvm-project/pull/83010