git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21411 91177308-0d34-0410-b5e6-96231b3b80d8
(strangely enough) a stable (determinstic) numbering for basic blocks. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14246 91177308-0d34-0410-b5e6-96231b3b80d8