revert mike's patch which broke test/CodeGen/no-common.c.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@67893 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/clang-cc/clang.cpp b/tools/clang-cc/clang.cpp
index 3b2afa9..7f46f46 100644
--- a/tools/clang-cc/clang.cpp
+++ b/tools/clang-cc/clang.cpp
@@ -1238,8 +1238,7 @@
 static llvm::cl::opt<bool>
 NoCommon("fno-common",
          llvm::cl::desc("Compile common globals like normal definitions"),
-         llvm::cl::ValueDisallowed, llvm::cl::AllowInverse,
-         llvm::cl::ZeroOrMore);
+         llvm::cl::ValueDisallowed);
 
 // It might be nice to add bounds to the CommandLine library directly.
 struct OptLevelParser : public llvm::cl::parser<unsigned> {