diff --git a/clang/include/clang/Basic/SourceManager.h b/clang/include/clang/Basic/SourceManager.h
--- a/clang/include/clang/Basic/SourceManager.h
+++ b/clang/include/clang/Basic/SourceManager.h
@@ -1645,8 +1645,7 @@
   unsigned local_sloc_entry_size() const { return LocalSLocEntryTable.size(); }
 
   /// Get a local SLocEntry. This is exposed for indexing.
-  const SrcMgr::SLocEntry &getLocalSLocEntry(unsigned Index,
-                                             bool *Invalid = nullptr) const {
+  const SrcMgr::SLocEntry &getLocalSLocEntry(unsigned Index) const {
     assert(Index < LocalSLocEntryTable.size() && "Invalid index");
     return LocalSLocEntryTable[Index];
   }
@@ -1739,12 +1738,13 @@
   const SrcMgr::SLocEntry &loadSLocEntry(unsigned Index, bool *Invalid) const;
 
   /// Get the entry with the given unwrapped FileID.
+  /// Invalid will not be modified for Local IDs.
   const SrcMgr::SLocEntry &getSLocEntryByID(int ID,
                                             bool *Invalid = nullptr) const {
     assert(ID != -1 && "Using FileID sentinel value");
     if (ID < 0)
       return getLoadedSLocEntryByID(ID, Invalid);
-    return getLocalSLocEntry(static_cast<unsigned>(ID), Invalid);
+    return getLocalSLocEntry(static_cast<unsigned>(ID));
   }
 
   const SrcMgr::SLocEntry &
diff --git a/clang/lib/Basic/SourceManager.cpp b/clang/lib/Basic/SourceManager.cpp
--- a/clang/lib/Basic/SourceManager.cpp
+++ b/clang/lib/Basic/SourceManager.cpp
@@ -882,11 +882,8 @@
   unsigned LessIndex = 0;
   NumProbes = 0;
   while (true) {
-    bool Invalid = false;
     unsigned MiddleIndex = (GreaterIndex-LessIndex)/2+LessIndex;
-    unsigned MidOffset = getLocalSLocEntry(MiddleIndex, &Invalid).getOffset();
-    if (Invalid)
-      return FileID::get(0);
+    unsigned MidOffset = getLocalSLocEntry(MiddleIndex).getOffset();
 
     ++NumProbes;
 
@@ -1694,11 +1691,7 @@
   // The location we're looking for isn't in the main file; look
   // through all of the local source locations.
   for (unsigned I = 0, N = local_sloc_entry_size(); I != N; ++I) {
-    bool Invalid = false;
-    const SLocEntry &SLoc = getLocalSLocEntry(I, &Invalid);
-    if (Invalid)
-      return FileID();
-
+    const SLocEntry &SLoc = getLocalSLocEntry(I);
     if (SLoc.isFile() && SLoc.getFile().getContentCache() &&
         SLoc.getFile().getContentCache()->OrigEntry == SourceFile)
       return FileID::get(I);