clang: Enable 2 stage bootstrap for clang-native
clang: Enable 2 stage bootstrap for clang-native

This will help in using clang Thin-LTO to compile clang itself

Signed-off-by: Khem Raj <729d64b6f67515e258459a5f6d20ec88b2caf8df@gmail.com>

kraj/meta-clang,kraj/meta-clang,kraj/meta-clang