[llvm] [LICM] Use DomTreeUpdater version of SplitBlockPredecessors, nfc (PR #107190)

[Matt Arsenault via llvm-commits]

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@@ -0,0 +1,889 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
+; RUN: opt -S -passes='cgscc(devirt<4>(inline,function<eager-inv;no-rerun>(early-cse<memssa>,simplifycfg<bonus-inst-threshold=1;no-forward-switch-cond;switch-range-to-icmp;no-switch-to-lookup;keep-loops;no-hoist-common-insts;no-hoist-loads-stores-with-cond-faulting;no-sink-common-insts;speculate-blocks;simplify-cond-branch;no-speculate-unpredictables>,loop-mssa(licm<allowspeculation>))))' < %s | FileCheck %s
+
+; Tests that we should not iterate over DomTreeNodes and modify the DomTree at the same time.
+
+target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
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arsenm wrote:

Shouldn't need triple or datalayout 

https://github.com/llvm/llvm-project/pull/107190