[llvm] [SelectionDAG] Skip chain node when updating divergence (PR #173885)

[Matt Arsenault via llvm-commits]

================
@@ -0,0 +1,32 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 6
+; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx1200 %s -o - | FileCheck %s
+
+define void @chain_node_divergence_update_crash() {
----------------
arsenm wrote:

Put issue number in function and/or file name? 

https://github.com/llvm/llvm-project/pull/173885