[llvm] [DomTree] Remove redundant getNode() calls. NFC (PR #215050)

[via llvm-commits]

github-actions[bot] wrote:

<!--PREMERGE ADVISOR COMMENT: Windows-->
# :window: Windows x64 Test Results

* 139505 tests passed
* 3660 tests skipped
* 1 test failed

## Failed Tests
(click on a test name to see its output)

### lld
<details>
<summary>lld.ELF/lto/thin-archivecollision.ll</summary>

```
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 2
rm -rf C:\_work\llvm-project\llvm-project\build\tools\lld\test\ELF\lto\Output\thin-archivecollision.ll.tmp && mkdir C:\_work\llvm-project\llvm-project\build\tools\lld\test\ELF\lto\Output\thin-archivecollision.ll.tmp && cd C:\_work\llvm-project\llvm-project\build\tools\lld\test\ELF\lto\Output\thin-archivecollision.ll.tmp
# executed command: rm -rf 'C:\_work\llvm-project\llvm-project\build\tools\lld\test\ELF\lto\Output\thin-archivecollision.ll.tmp'
# note: command had no output on stdout or stderr
# executed command: mkdir 'C:\_work\llvm-project\llvm-project\build\tools\lld\test\ELF\lto\Output\thin-archivecollision.ll.tmp'
# note: command had no output on stdout or stderr
# executed command: cd 'C:\_work\llvm-project\llvm-project\build\tools\lld\test\ELF\lto\Output\thin-archivecollision.ll.tmp'
# note: command had no output on stdout or stderr
# RUN: at line 3
mkdir d e
# executed command: mkdir d e
# note: command had no output on stdout or stderr
# RUN: at line 4
c:\_work\llvm-project\llvm-project\build\bin\opt.exe -module-summary C:\_work\llvm-project\llvm-project\lld\test\ELF\lto\thin-archivecollision.ll -o b.bc
# executed command: 'c:\_work\llvm-project\llvm-project\build\bin\opt.exe' -module-summary 'C:\_work\llvm-project\llvm-project\lld\test\ELF\lto\thin-archivecollision.ll' -o b.bc
# note: command had no output on stdout or stderr
# RUN: at line 5
mkdir -p C:\_work\llvm-project\llvm-project\build\tools\lld\test\ELF\lto\Output\thin-archivecollision.ll.tmp1 C:\_work\llvm-project\llvm-project\build\tools\lld\test\ELF\lto\Output\thin-archivecollision.ll.tmp2
# executed command: mkdir -p 'C:\_work\llvm-project\llvm-project\build\tools\lld\test\ELF\lto\Output\thin-archivecollision.ll.tmp1' 'C:\_work\llvm-project\llvm-project\build\tools\lld\test\ELF\lto\Output\thin-archivecollision.ll.tmp2'
# note: command had no output on stdout or stderr
# RUN: at line 6
c:\_work\llvm-project\llvm-project\build\bin\opt.exe -module-summary C:\_work\llvm-project\llvm-project\lld\test\ELF\lto/Inputs/thin1.ll -o d/coll.o
# executed command: 'c:\_work\llvm-project\llvm-project\build\bin\opt.exe' -module-summary 'C:\_work\llvm-project\llvm-project\lld\test\ELF\lto/Inputs/thin1.ll' -o d/coll.o
# note: command had no output on stdout or stderr
# RUN: at line 7
c:\_work\llvm-project\llvm-project\build\bin\opt.exe -module-summary C:\_work\llvm-project\llvm-project\lld\test\ELF\lto/Inputs/thin2.ll -o e/coll.o
# executed command: 'c:\_work\llvm-project\llvm-project\build\bin\opt.exe' -module-summary 'C:\_work\llvm-project\llvm-project\lld\test\ELF\lto/Inputs/thin2.ll' -o e/coll.o
# note: command had no output on stdout or stderr
# RUN: at line 9
llvm-ar rcS d/a.a d/coll.o e/coll.o
# executed command: llvm-ar rcS d/a.a d/coll.o e/coll.o
# note: command had no output on stdout or stderr
# RUN: at line 10
c:\_work\llvm-project\llvm-project\build\bin\ld.lld.exe b.bc d/a.a -o out --save-temps
# executed command: 'c:\_work\llvm-project\llvm-project\build\bin\ld.lld.exe' b.bc d/a.a -o out --save-temps
# note: command had no output on stdout or stderr
# RUN: at line 11
c:\_work\llvm-project\llvm-project\build\bin\llvm-nm.exe out | c:\_work\llvm-project\llvm-project\build\bin\filecheck.exe C:\_work\llvm-project\llvm-project\lld\test\ELF\lto\thin-archivecollision.ll
# executed command: 'c:\_work\llvm-project\llvm-project\build\bin\llvm-nm.exe' out
# note: command had no output on stdout or stderr
# executed command: 'c:\_work\llvm-project\llvm-project\build\bin\filecheck.exe' 'C:\_work\llvm-project\llvm-project\lld\test\ELF\lto\thin-archivecollision.ll'
# note: command had no output on stdout or stderr
# RUN: at line 13
c:\_work\llvm-project\llvm-project\build\bin\llvm-nm.exe d/out.lto.a.a*at*.o | c:\_work\llvm-project\llvm-project\build\bin\filecheck.exe C:\_work\llvm-project\llvm-project\lld\test\ELF\lto\thin-archivecollision.ll --check-prefix=MOD2
# executed command: 'c:\_work\llvm-project\llvm-project\build\bin\llvm-nm.exe' 'd/out.lto.a.a*at*.o'
# note: command had no output on stdout or stderr
# executed command: 'c:\_work\llvm-project\llvm-project\build\bin\filecheck.exe' 'C:\_work\llvm-project\llvm-project\lld\test\ELF\lto\thin-archivecollision.ll' --check-prefix=MOD2
# note: command had no output on stdout or stderr
# RUN: at line 16
rm d/out.lto.a.a*at*.o
# executed command: rm 'd/out.lto.a.a*at*.o'
# note: command had no output on stdout or stderr
# RUN: at line 17
c:\_work\llvm-project\llvm-project\build\bin\ld.lld.exe b.bc --whole-archive d/a.a -o out --save-temps
# executed command: 'c:\_work\llvm-project\llvm-project\build\bin\ld.lld.exe' b.bc --whole-archive d/a.a -o out --save-temps
# .---command stderr------------
# | failed to open d/a.a(coll.o at 2612).4.opt.bc: invalid argument
# `-----------------------------
# error: command failed with exit status: 1

--

```
</details>

If these failures are unrelated to your changes (for example tests are broken or flaky at HEAD), please open an issue at https://github.com/llvm/llvm-project/issues and add the `infrastructure` label.

https://github.com/llvm/llvm-project/pull/215050