[analyzer] Suppress optin.cplusplus.VirtualCall warnings in system headers (#184183) Fixes #184178 The optin.cplusplus.VirtualCall checker reports warnings for virtual method calls during construction/destruction even when the call site is in a system header (included via -isystem). Users cannot fix such code and must resort to NOLINT suppressions. Add a system header check in checkPreCall before emitting the report, consistent with how other checkers (e.g. MallocChecker) handle this.
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