[BlockExtractor] Change the basic block separator from ',' to ';'

This change aims at making the file format be compatible with the
way LLVM handles command line options.

Differential Revision: https://reviews.llvm.org/D60970

llvm-svn: 359462
diff --git a/llvm/lib/Transforms/IPO/BlockExtractor.cpp b/llvm/lib/Transforms/IPO/BlockExtractor.cpp
index 31c09eb..5cf2235 100644
--- a/llvm/lib/Transforms/IPO/BlockExtractor.cpp
+++ b/llvm/lib/Transforms/IPO/BlockExtractor.cpp
@@ -94,7 +94,7 @@
     if (LineSplit.empty())
       continue;
     SmallVector<StringRef, 4> BBNames;
-    LineSplit[1].split(BBNames, ',', /*MaxSplit=*/-1,
+    LineSplit[1].split(BBNames, ';', /*MaxSplit=*/-1,
                        /*KeepEmpty=*/false);
     if (BBNames.empty())
       report_fatal_error("Missing bbs name");