Add TargetInfo::useNeXTRuntimeAsDefault
 - Used to autoselect runtime when neither -fnext-runtime nor
   -fgnu-runtime is specified.
 - Default impl is false, all darwin targets set it to true.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@55231 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed