Probe for flags before using them to try to help compiling with compilers that don't support those flags.  This hopefully will help gcc 3.X compile this code.  http://llvm.org/PR3487
Probe for flags before using them to try to help compiling with
compilers that don't support those flags.  This hopefully will help
gcc 3.X compile this code.  http://llvm.org/PR3487


git-svn-id: a4a6f32337ebd29ad4763b423022f00f68d1c7b7@63882 91177308-0d34-0410-b5e6-96231b3b80d8

lodyagin/bare_cxx,lodyagin/bare_cxx,lodyagin/bare_cxx,lodyagin/bare_cxx,lodyagin/bare_cxx