Access to ProcessEventsToSignal's bSignal is racy

...so spell out its single use, locking the appropriate mutex around the access

Change-Id: I8e8f47de1979f5a80cf1ad65e5ec24d25145c463
Reviewed-on: https://gerrit.libreoffice.org/42908
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

compilerplugins/clang/constparams.cxx

@@ -181,8 +181,6 @@ bool ConstParams::VisitFunctionDecl(const FunctionDecl * functionDecl)
             || name == "convert_slashes"
                 // UNO component entry points
             || name.endswith("component_getFactory")
-                // in Scheduler::, wants to loop until a reference to a bool becomes true
-            || name == "ProcessEventsToSignal"
                 // external API
             || name == "Java_com_sun_star_sdbcx_comp_hsqldb_StorageNativeOutputStream_flush"
             || name == "egiGraphicExport"