[clang] [CIR] Fix union RecordType::getTypeSizeInBits to return bits (PR #191516)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-aarch64-sve2-vla` running on `linaro-g4-01` while building `clang` at step 14 "test-suite".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/198/builds/12777

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

```
Step 14 (test-suite) failure: test (failure)
...
size..init_array: 16 
size..interp: 27 
size..note.ABI-tag: 32 
size..plt: 992 
size..rela.dyn: 3240 
size..rela.plt: 1440 
size..rodata: 26950 
size..text: 719808 
********************
NOEXE: test-suite :: Fortran/cray/OpenMP/5.0/depend_iterator_01.test (1538 of 10406)
******************** TEST 'test-suite :: Fortran/cray/OpenMP/5.0/depend_iterator_01.test' FAILED ********************
Executable '/home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/test/sandbox/build/Fortran/cray/OpenMP/5.0/depend_iterator_01' is missing
********************
NOEXE: test-suite :: Fortran/cray/OpenMP/5.0/depend_iterator_02.test (1539 of 10406)
******************** TEST 'test-suite :: Fortran/cray/OpenMP/5.0/depend_iterator_02.test' FAILED ********************
Executable '/home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/test/sandbox/build/Fortran/cray/OpenMP/5.0/depend_iterator_02' is missing
********************
PASS: test-suite :: Fortran/UnitTests/fcvs21_f95/FM822.test (1540 of 10406)
********** TEST 'test-suite :: Fortran/UnitTests/fcvs21_f95/FM822.test' RESULTS **********
compile_time: 0.0000 
exec_time: 0.0007 
hash: "2f4924e337250517df6ced0689e28393" 
link_time: 0.0000 
size: 1158464 
size..bss: 336 
size..comment: 258 
size..data: 928 
size..data.rel.ro: 416 
size..dynamic: 496 
size..dynstr: 663 
size..dynsym: 1704 
size..eh_frame: 48544 
size..eh_frame_hdr: 12156 
size..fini: 20 
size..fini_array: 8 
size..gnu.hash: 28 
size..gnu.version: 142 
size..gnu.version_r: 96 
size..got: 368 
size..got.plt: 512 
size..init: 24 
size..init_array: 16 
size..interp: 27 
size..note.ABI-tag: 32 
size..plt: 1008 
size..rela.dyn: 3264 
size..rela.plt: 1464 
size..rodata: 27318 
size..text: 721872 

```

</details>

https://github.com/llvm/llvm-project/pull/191516