Use scope-resolution operator to hopefully unbreak Windows builds.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@182509 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/StaticAnalyzer/Core/BugReporter.cpp b/lib/StaticAnalyzer/Core/BugReporter.cpp
index 28326ee..b8be539 100644
--- a/lib/StaticAnalyzer/Core/BugReporter.cpp
+++ b/lib/StaticAnalyzer/Core/BugReporter.cpp
@@ -2016,7 +2016,7 @@
     if (Invalid)
       continue;
 
-    if (abs(startCol - endCol) <= 2) {
+    if (::abs(startCol - endCol) <= 2) {
       I = path.erase(I);
       erased = true;
       continue;