[llvm] RuntimeLibcalls: Use get_host_tool_path for executables used in benchmark (PR #153955)

[Brendan Dahl via llvm-commits]

brendandahl wrote:

We're seeing failures from this chain of patches in the emscripten toolchain. It doesn't appear any of the follow ups have fixed it either.


```
CMake Error at benchmarks/CMakeLists.txt:23 (if):
  if given arguments:

    "TARGET" "AND" "TARGET"

  Unknown arguments specified
 ```

https://logs.chromium.org/logs/emscripten-releases/buildbucket/cr-buildbucket/8703371298336821617/+/u/Build_LLVM__cross_/stdout

https://github.com/llvm/llvm-project/pull/153955