[X86][AArch64][PowerPC] __builtin_cpu_supports accepts unknown options. (#83515)

The patch fixes https://github.com/llvm/llvm-project/issues/83407
modifing __builtin_cpu_supports behaviour so that it returns false if
unsupported features names provided in parameter and issue a warning.
__builtin_cpu_supports is target independent, but currently supported by
X86, AArch64 and PowerPC only.