Fix typos of occurred and occurrence

llvm-svn: 323318
diff --git a/llvm/utils/unittest/googletest/src/gtest-filepath.cc b/llvm/utils/unittest/googletest/src/gtest-filepath.cc
index 0292dc1..3bb2754 100644
--- a/llvm/utils/unittest/googletest/src/gtest-filepath.cc
+++ b/llvm/utils/unittest/googletest/src/gtest-filepath.cc
@@ -130,7 +130,7 @@
   return *this;
 }
 
-// Returns a pointer to the last occurence of a valid path separator in
+// Returns a pointer to the last occurrence of a valid path separator in
 // the FilePath. On Windows, for example, both '/' and '\' are valid path
 // separators. Returns NULL if no path separator was found.
 const char* FilePath::FindLastPathSeparator() const {