Bug 23005 – importC: 'alignof' or 'mangleof' as member name gives redefinition error

struct S { int alignof, mangleof; }; union U { int alignof, mangleof; }; enum E { alignof, mangleof }; test.c(1): Error: variable `test.S.alignof` `.alignof` property cannot be redefined test.c(1): Error: variable `test.S.mangleof` `.mangleof` property cannot be redefined test.c(2): Error: variable `test.U.alignof` `.alignof` property cannot be redefined test.c(2): Error: variable `test.U.mangleof` `.mangleof` property cannot be redefined test.c(3): Error: enum member `test.E.alignof` `.alignof` property cannot be redefined test.c(3): Error: enum member `test.E.mangleof` `.mangleof` property cannot be redefined

merged with 23004