C++ feature checks: Filter out warnings caused by user flags
Filter out -Winvalid-command-line-argument warnings from Clang (that can be caused by user-specified flags) so that they do not break our checks for C++ feature availability.
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Filter out -Winvalid-command-line-argument warnings from Clang (that can be caused by user-specified flags) so that they do not break our checks for C++ feature availability.