filter out non-const global vars from stdio.h iostream and placeholders.hpp
add support::isSafeClass filter to FunctionChecker
check the variable qualifier for safe class names
Merge pull request #1476 from gartung/clang-FunctionChecker-filter-safe-statics

Static Analyzer  -- Filter out safe non-const global vars
Merge remote-tracking branch 'origin/CMSSW_7_0_X' into CMSSW_7_0_X