Index: tools/llvm-cov/CodeCoverage.cpp
===================================================================
--- tools/llvm-cov/CodeCoverage.cpp
+++ tools/llvm-cov/CodeCoverage.cpp
@@ -401,6 +401,12 @@
 
   // Create a mapping from coverage data file paths to local paths.
   for (StringRef Filename : Coverage.getUniqueSourceFiles()) {
+    // Don't remap paths that exist.
+    llvm::sys::fs::file_status Status;
+    llvm::sys::fs::status(Filename, Status);
+    if (llvm::sys::fs::exists(Status))
+      continue;
+
     SmallString<128> NativeFilename;
     sys::path::native(Filename, NativeFilename);
     if (NativeFilename.startswith(RemapFrom)) {