instead of forcing blocks on by default, make them default to off, but let
specific targets default them to on.  Default blocks to on on 10.6 and later.
Add a -fblocks option that allows the user to override the target's default.
Use -fblocks in the various testcases that use blocks.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@60563 91177308-0d34-0410-b5e6-96231b3b80d8
17 files changed