[compiler-rt] [NFC][CFI] Add minimal runtime test for CFI (PR #137245)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `premerge-monolithic-linux` running on `premerge-linux-1` while building `compiler-rt` at step 7 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/153/builds/29941

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

```
Step 7 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'UBSan-Minimal-x86_64-linux :: TestCases/icall.c' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
/build/buildbot/premerge-monolithic-linux/build/./bin/clang  -fsanitize-minimal-runtime  -m64  -fsanitize=cfi-icall -fno-sanitize-trap=cfi-icall -flto -fvisibility=hidden /build/buildbot/premerge-monolithic-linux/llvm-project/compiler-rt/test/ubsan_minimal/TestCases/icall.c -o /build/buildbot/premerge-monolithic-linux/build/runtimes/runtimes-bins/compiler-rt/test/ubsan_minimal/x86_64/TestCases/Output/icall.c.tmp && not --crash  /build/buildbot/premerge-monolithic-linux/build/runtimes/runtimes-bins/compiler-rt/test/ubsan_minimal/x86_64/TestCases/Output/icall.c.tmp 2>&1 | FileCheck /build/buildbot/premerge-monolithic-linux/llvm-project/compiler-rt/test/ubsan_minimal/TestCases/icall.c # RUN: at line 1
+ /build/buildbot/premerge-monolithic-linux/build/./bin/clang -fsanitize-minimal-runtime -m64 -fsanitize=cfi-icall -fno-sanitize-trap=cfi-icall -flto -fvisibility=hidden /build/buildbot/premerge-monolithic-linux/llvm-project/compiler-rt/test/ubsan_minimal/TestCases/icall.c -o /build/buildbot/premerge-monolithic-linux/build/runtimes/runtimes-bins/compiler-rt/test/ubsan_minimal/x86_64/TestCases/Output/icall.c.tmp
/usr/bin/ld: /build/buildbot/premerge-monolithic-linux/build/bin/../lib/LLVMgold.so: error loading plugin: /build/buildbot/premerge-monolithic-linux/build/bin/../lib/LLVMgold.so: cannot open shared object file: No such file or directory
clang: error: linker command failed with exit code 1 (use -v to see invocation)

--

********************


```

</details>

https://github.com/llvm/llvm-project/pull/137245