Revert "[libc++][format] Add basic_format_parse_context."

This reverts commit 35a57f39b5d126646335183f1ff0f7adb52d63bc.

A build is broken during clang bootstrap with:

In file included from ../libcxx/src/format.cpp:9:
/tmp/ci-nGNyLRM9V3/include/c++/v1/format:153:16: error: no member named 'is_constant_evaluated' in namespace 'std::__1'
    if (_VSTD::is_constant_evaluated() && __id >= __num_args_)
        ~~~~~~~^
1 error generated.

GitOrigin-RevId: 68f66f37d7d74be7beba56506c4397dadc8538dd
8 files changed