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8f863fcd77
Between C++26 and Clang modules build of runtimes, which are used as an additional testing for Clang, the only difference are `LIBCXX_TEST_PARAMS` and `LIBCXXABI_TEST_PARAMS`. Both of them are transformed into actual lit configuration lines, and put into `SERIALIZED_LIT_PARAMS`, which end up in `libcxx/test/cmake-bridge.cfg` via `configure_file` command. Notably, it seems that they are not used in any other way. I checked that if those variables are changed, subsequent runs of CMake configuration step regenerate `cmake-bridge.cfg` with the new values. Which means that we don't need to do clean builds for every runtimes configuration we want to test. I hope that together with #131913, this will be enough to alleviate Linux CI pains we're having, and we wouldn't have to make a tough choice between C++26 and Clang modules builds for pre-merge CI.