[ASan] Make -fsanitize=address imply -fsanitize=init-order (if the latter is not explicitly disabled).

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@177061 91177308-0d34-0410-b5e6-96231b3b80d8
[ASan] Update docs for -fsanitize=init-order option

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@177062 91177308-0d34-0410-b5e6-96231b3b80d8
Documentation: improve formatting


git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@177066 91177308-0d34-0410-b5e6-96231b3b80d8