Moved 25 flags to clang_ignored_gcc_optimization_f_Group. Will display a warning
to the user if they try to pass those optimizations. The revision for this patch
is here: http://reviews.llvm.org/D4474. This patch will fix many errors in the
rebuild of Debian with clang. Here is a link to the page for unknown arguments:
http://clang.debian.net/status.php?version=3.4.2&key=UNKNOWN_ARG


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@213365 91177308-0d34-0410-b5e6-96231b3b80d8