03adb0ec7d
VirtualCallChecker.cpp implements two related checkers: - `optin.cplusplus.VirtualCall` which reports situations when constructors or destructors call virtual methods (which is bugprone because it does not trigger virtual dispatch, but can be legitmate). - `cplusplus.PureVirtualCall` reports situations when constructors or destructors call _pure_ virtual methods, which is an error. Six years ago these two bug types were both reported by the same checker (called `optin.cplusplus.VirtualCall`) and it had an option called `PureOnly` which limited its output to the pure case. When (in 2019) the two checker parts were separated by the commit d3971fe97b64785c079d64bf4c8c3e2b5e1f85a1, the option `PureOnly` was preserved for the sake of compatibility, but it is no longer useful (when it is set to true, it just suppresses all reports from `optin.cplusplus.VirtualCall`) so it was marked as deprecated. I'm removing this deprecated option now because it is no longer relevant and its presence caused minor complications when I was porting `VirtualCallChecker.cpp` to the new multipart checker framework (introduced in 27099982da2f5a6c2d282d6b385e79d080669546).
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