[libc-commits] [libc] [llvm] [libc][math] Refactor ilogbf128 to Header Only (PR #175396)

[Muhammad Bassiouni via libc-commits]

bassiounix wrote:

```txt
CMake Error at /home/runner/work/llvm-project/llvm-project/libc/cmake/modules/LLVMLibCLibraryRules.cmake:5 (get_target_property):
  get_target_property() called with non-existent target
  "libc.src.__support.math.fsqrt".
Call Stack (most recent call first):
  /home/runner/work/llvm-project/llvm-project/libc/cmake/modules/LLVMLibCLibraryRules.cmake:35 (collect_object_file_deps)
  /home/runner/work/llvm-project/llvm-project/libc/cmake/modules/LLVMLibCLibraryRules.cmake:35 (collect_object_file_deps)
  /home/runner/work/llvm-project/llvm-project/libc/cmake/modules/LLVMLibCLibraryRules.cmake:61 (collect_object_file_deps)
  /home/runner/work/llvm-project/llvm-project/libc/cmake/modules/LLVMLibCLibraryRules.cmake:139 (get_all_object_file_deps)
  /home/runner/work/llvm-project/llvm-project/libc/lib/CMakeLists.txt:22 (add_entrypoint_library)
```

https://github.com/llvm/llvm-project/pull/175396