[Tooling] NFC, use const HeaderSearch for isSelfContainedHeader.

Author: hokein

clang/include/clang/Tooling/Inclusions/HeaderAnalysis.h

@@ -28,7 +28,7 @@ namespace tooling {
 /// This function can be expensive as it may scan the source code to find out
 /// dont-include-me pattern heuristically.
 bool isSelfContainedHeader(const FileEntry *FE, const SourceManager &SM,
-                           HeaderSearch &HeaderInfo);
+                           const HeaderSearch &HeaderInfo);
 
 /// This scans the given source code to see if it contains #import(s).
 bool codeContainsImports(llvm::StringRef Code);

clang/lib/Tooling/Inclusions/HeaderAnalysis.cpp

@@ -67,7 +67,7 @@ llvm::StringRef getFileContents(const FileEntry *FE, const SourceManager &SM) {
 } // namespace
 
 bool isSelfContainedHeader(const FileEntry *FE, const SourceManager &SM,
-                           HeaderSearch &HeaderInfo) {
+                           const HeaderSearch &HeaderInfo) {
   assert(FE);
   if (!HeaderInfo.isFileMultipleIncludeGuarded(FE) &&
       !HeaderInfo.hasFileBeenImported(FE) &&