[llvm] [SelectionDAG] Use emplace_back. NFC (PR #173824)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `lldb-aarch64-windows` running on `linaro-armv8-windows-msvc-05` while building `llvm` at step 6 "test".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/141/builds/14042

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 6 (test) failure: build (failure)
...
UNSUPPORTED: lldb-api :: functionalities/breakpoint/objc/TestObjCBreakpoints.py (350 of 2387)
PASS: lldb-api :: functionalities/breakpoint/same_cu_name/TestFileBreakpointsSameCUName.py (351 of 2387)
XFAIL: lldb-api :: functionalities/breakpoint/scripted_bkpt/was_hit/TestWasHit.py (352 of 2387)
PASS: lldb-api :: functionalities/breakpoint/scripted_bkpt/TestScriptedResolver.py (353 of 2387)
PASS: lldb-api :: functionalities/breakpoint/source_regexp/TestSourceRegexBreakpoints.py (354 of 2387)
PASS: lldb-api :: functionalities/breakpoint/serialize/TestBreakpointSerialization.py (355 of 2387)
PASS: lldb-api :: functionalities/breakpoint/step_over_breakpoint/TestStepOverBreakpoint.py (356 of 2387)
PASS: lldb-api :: functionalities/breakpoint/two_hits_one_actual/TestTwoHitsOneActual.py (357 of 2387)
XFAIL: lldb-api :: functionalities/bt-interrupt/TestInterruptBacktrace.py (358 of 2387)
PASS: lldb-api :: functionalities/breakpoint/thread_plan_user_breakpoint/TestThreadPlanUserBreakpoint.py (359 of 2387)
FAIL: lldb-api :: functionalities/conditional_break/TestConditionalBreak.py (360 of 2387)
******************** TEST 'lldb-api :: functionalities/conditional_break/TestConditionalBreak.py' FAILED ********************
Script:
--
C:/Users/tcwg/scoop/apps/python/current/python.exe C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/llvm-project/lldb\test\API\dotest.py -u CXXFLAGS -u CFLAGS --env LLVM_LIBS_DIR=C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/./lib --env LLVM_INCLUDE_DIR=C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/include --env LLVM_TOOLS_DIR=C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/./bin --arch aarch64 --build-dir C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/lldb-test-build.noindex --lldb-module-cache-dir C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/lldb-test-build.noindex/module-cache-lldb\lldb-api --clang-module-cache-dir C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/lldb-test-build.noindex/module-cache-clang\lldb-api --executable C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/./bin/lldb.exe --compiler C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/./bin/clang.exe --dsymutil C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/./bin/dsymutil.exe --make C:/Users/tcwg/scoop/shims/make.exe --llvm-tools-dir C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/./bin --lldb-obj-root C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/tools/lldb --lldb-libs-dir C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/./lib --cmake-build-type Release --skip-category=watchpoint C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\lldb\test\API\functionalities\conditional_break -p TestConditionalBreak.py
--
Exit Code: 1

Command Output (stdout):
--
lldb version 22.0.0git (https://github.com/llvm/llvm-project.git revision 65f9374cecf1ee329c280c0904d90e121f0957b1)
  clang revision 65f9374cecf1ee329c280c0904d90e121f0957b1
  llvm revision 65f9374cecf1ee329c280c0904d90e121f0957b1
Executing commands in 'C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\lldb\test\API\functionalities\conditional_break\.lldb'.
(lldb) breakpoint set -n c
Breakpoint 1: where = a.out`c + 8 at main.c:31:12, address = 0x0000000140001094
(lldb) command script import -r conditional_break.py
(lldb) breakpoint command add 1 -F "conditional_break.stop_if_called_from_a"
a(1) returns 4

b(2) returns 5

a(3) returns 6

Skipping the following test categories: watchpoint, libc++, libstdcxx, dwo, dsym, gmodules, debugserver, objc, fork, pexpect


--
Command Output (stderr):
--
UNSUPPORTED: LLDB (C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\build\bin\clang.exe-aarch64) :: test_with_command_dsym (TestConditionalBreak.ConditionalBreakTestCase.test_with_command_dsym) (test case does not fall in any category of interest for this run) 

PASS: LLDB (C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\build\bin\clang.exe-aarch64) :: test_with_command_dwarf (TestConditionalBreak.ConditionalBreakTestCase.test_with_command_dwarf)

UNSUPPORTED: LLDB (C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\build\bin\clang.exe-aarch64) :: test_with_command_dwo (TestConditionalBreak.ConditionalBreakTestCase.test_with_command_dwo) (test case does not fall in any category of interest for this run) 

UNSUPPORTED: LLDB (C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\build\bin\clang.exe-aarch64) :: test_with_python_dsym (TestConditionalBreak.ConditionalBreakTestCase.test_with_python_dsym) (test case does not fall in any category of interest for this run) 

FAIL: LLDB (C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\build\bin\clang.exe-aarch64) :: test_with_python_dwarf (TestConditionalBreak.ConditionalBreakTestCase.test_with_python_dwarf)

```

</details>

https://github.com/llvm/llvm-project/pull/173824