libcxxrt: Update to upstream 698997bfde1f

Interesting fixes:

045c52c Mark __cxa_allocate_exception, __cxa_free_exception and
__cxa_init_primary_exception noexcept.
8a2f123 Define _LIBCXXRT_

libcxxrt: Update to upstream 698997bfde1f

Interesting fixes:

045c52c Mark __cxa_allocate_exception, __cxa_free_exception and
__cxa_init_primary_exception noexcept.
8a2f123 Define _LIBCXXRT_NOEXCEPT in cxxabi.h and use it instead of
throw()
9529236 Fix memory corruption in cpp_demangle_read_sname()
8f5c74e Add test cases, fix more bugs, and improve perf
391a3dc Add a simple implementation of __cxa_call_terminate
40e4fa2 mark std::terminate as noreturn and noexcept
5eede09 Print diagnostics in default std::terminate handler

Reviewed by: dim
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D47238

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Merge libcxxrt master fd484be8d1e94a1fcf6bc5c67e5c07b65ada19b6

Interesting fixes:
47661d0 Match libc++abi/libsupc++ when demangling array types
e44a05c Fix unitialized variable in __cxa_demangle_gnu

Merge libcxxrt master fd484be8d1e94a1fcf6bc5c67e5c07b65ada19b6

Interesting fixes:
47661d0 Match libc++abi/libsupc++ when demangling array types
e44a05c Fix unitialized variable in __cxa_demangle_gnu3 after #6 (#8)
5088b05 Remove some code duplication.
fd484be Atomics cleanup (#11)

MFC after: 2 weeks

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