[clang] [clang][bytecode][NFC] Simplify a few builtin implementations (PR #160910)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `ppc64le-flang-rhel-clang` running on `ppc64le-flang-rhel-test` while building `clang` at step 5 "build-unified-tree".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/157/builds/40613

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

```
Step 5 (build-unified-tree) failure: build (failure) (timed out)
...
41.102 [6371/25/657] Generating ../../../../share/scan-view/bugcatcher.ico
41.102 [6371/24/658] Generating ../../../../share/scan-view/startfile.py
41.102 [6371/23/659] Linking CXX static library lib/libLLVMDemangle.a
41.108 [6371/22/660] Linking CXX static library lib/libFortranDecimal.a
41.108 [6371/21/661] Linking CXX static library lib/libbenchmark.a
41.131 [6370/21/662] Linking CXX executable bin/llvm-PerfectShuffle
41.131 [6370/20/663] Linking CXX static library lib/libDynamicLibraryLib.a
41.132 [6370/19/664] Linking CXX shared module unittests/Support/DynamicLibrary/PipSqueak.so
41.132 [6370/18/665] Linking CXX shared module unittests/Support/DynamicLibrary/SecondLib.so
41.413 [6370/17/666] Linking CXX static library lib/libbenchmark_main.a
command timed out: 1200 seconds without output running [b'ninja'], attempting to kill
process killed by signal 9
program finished with exit code -1
elapsedTime=1241.927750

```

</details>

https://github.com/llvm/llvm-project/pull/160910