llvm-cov: Combine two types that were nearly identical (NFC)

llvm-cov had a SourceRange type that was nearly identical to a
CountedRegion except that it shaved off a couple of fields. There
aren't likely to be enough of these for the minor memory savings to be
worth the extra complexity here.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217417 91177308-0d34-0410-b5e6-96231b3b80d8

tools/llvm-cov/CodeCoverage.cpp

@@ -36,8 +36,9 @@
 #include "llvm/Support/Path.h"
 #include "llvm/Support/Signals.h"
 #include "llvm/Support/PrettyStackTrace.h"
-#include <system_error>
 #include <functional>
+#include <system_error>
+#include <unordered_map>
 
 using namespace llvm;
 using namespace coverage;