Adrian Prantl d951ca5439 Revert "[Driver] Enable to use C++20 standalne by -fcxx-modules" ...

This reverts commit a544710cd4.

See discussion in D120540.

This breaks C++ Clang modules on Darwin and also more than a dozen
tests in the LLDB testsuite.  I think we need to be more careful to
separate out the enabling of Clang C++ modules and C++20
modules. Either by having -fmodules-ts control the HaveModules flag,
or by adding a way to explicitly turn them off.

2022-06-01 12:11:57 -07:00

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