[NFC][IR] De-duplicate CFI related code

[vitalybuka]

No description provided.

[llvm-ci]

LLVM Buildbot has detected a new failure on builder clang-aarch64-sve-vla-2stage running on linaro-g3-04 while building llvm at step 12 "ninja check 2".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/41/builds/5459

Here is the relevant piece of the build log for the reference

Step 12 (ninja check 2) failure: 1200 seconds without output running [b'ninja', b'check-all'], attempting to kill
...
PASS: lld :: wasm/why-extract.s (97040 of 97050)
PASS: lld :: MachO/order-file.s (97041 of 97050)
PASS: libFuzzer-aarch64-default-Linux :: value-profile-switch.test (97042 of 97050)
PASS: lld :: wasm/libsearch.s (97043 of 97050)
PASS: lld :: MachO/weak-definition-direct-fetch.s (97044 of 97050)
PASS: lld :: MachO/loh-adrp-add.s (97045 of 97050)
PASS: mlgo-utils :: corpus/extract_ir_test.py (97046 of 97050)
PASS: libFuzzer-aarch64-default-Linux :: strncmp.test (97047 of 97050)
PASS: lld :: MinGW/driver.test (97048 of 97050)
PASS: libFuzzer-aarch64-default-Linux :: value-profile-load.test (97049 of 97050)
command timed out: 1200 seconds without output running [b'ninja', b'check-all'], attempting to kill
process killed by signal 9
program finished with exit code -1
elapsedTime=1949.502470