Add clang_Location_isFromMainFile() to libclang.

Also bump the minor version number and update libclang.exports.

Reviewed by: Dmitri Gribenko, Doug Gregor

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@187994 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/clang-c/Index.h b/include/clang-c/Index.h
index 1adaa48..51b1a8c 100644
--- a/include/clang-c/Index.h
+++ b/include/clang-c/Index.h
@@ -32,7 +32,7 @@
  * compatible, thus CINDEX_VERSION_MAJOR is expected to remain stable.
  */
 #define CINDEX_VERSION_MAJOR 0
-#define CINDEX_VERSION_MINOR 19
+#define CINDEX_VERSION_MINOR 20
 
 #define CINDEX_VERSION_ENCODE(major, minor) ( \
       ((major) * 10000)                       \
@@ -414,6 +414,12 @@
 CINDEX_LINKAGE int clang_Location_isInSystemHeader(CXSourceLocation location);
 
 /**
+ * \brief Returns non-zero if the given source location is in the main file of
+ * the corresponding translation unit.
+ */
+CINDEX_LINKAGE int clang_Location_isFromMainFile(CXSourceLocation location);
+
+/**
  * \brief Retrieve a NULL (invalid) source range.
  */
 CINDEX_LINKAGE CXSourceRange clang_getNullRange(void);