Fixed #6327 (Unwanted constStatement on (void)0)
Fixed #6346 (pointer calculation overflow)
Fix FP if sizeof is used without parentheses on struct members

Right now we only support checking basic pointer types.
Pointers inside structs are not supported yet.

Consider the tokens "foo@1 . bar@2",
Token::Match( "sizeof ( %varid% )" ) won't match it.
Token::Match( "sizeof %varid%" ) did match it -> FP.
Add test cases when sizeof is used on struct members
Merge branch 'master' into travis_gcc_testsuite