diff --git a/lldb/include/lldb/Symbol/LineTable.h b/lldb/include/lldb/Symbol/LineTable.h
--- a/lldb/include/lldb/Symbol/LineTable.h
+++ b/lldb/include/lldb/Symbol/LineTable.h
@@ -71,7 +71,8 @@
   void InsertLineEntry(lldb::addr_t file_addr, uint32_t line, uint16_t column,
                        uint16_t file_idx, bool is_start_of_statement,
                        bool is_start_of_basic_block, bool is_prologue_end,
-                       bool is_epilogue_begin, bool is_terminal_entry);
+                       bool is_epilogue_begin, bool is_terminal_entry,
+                       bool overwrite_existing = false);
 
   // Used to instantiate the LineSequence helper class
   static std::unique_ptr<LineSequence> CreateLineSequenceContainer();
diff --git a/lldb/source/Symbol/LineTable.cpp b/lldb/source/Symbol/LineTable.cpp
--- a/lldb/source/Symbol/LineTable.cpp
+++ b/lldb/source/Symbol/LineTable.cpp
@@ -41,7 +41,8 @@
                                 bool is_start_of_statement,
                                 bool is_start_of_basic_block,
                                 bool is_prologue_end, bool is_epilogue_begin,
-                                bool is_terminal_entry) {
+                                bool is_terminal_entry,
+                                bool overwrite_existing) {
   Entry entry(file_addr, line, column, file_idx, is_start_of_statement,
               is_start_of_basic_block, is_prologue_end, is_epilogue_begin,
               is_terminal_entry);
@@ -49,7 +50,14 @@
   LineTable::Entry::LessThanBinaryPredicate less_than_bp(this);
   entry_collection::iterator pos =
       llvm::upper_bound(m_entries, entry, less_than_bp);
-
+  if (overwrite_existing && pos != m_entries.begin()) {
+    --pos;
+    if (pos->file_addr == file_addr) {
+      uint32_t idx = std::distance(m_entries.begin(), pos);
+      m_entries[idx] = entry;
+      return;
+    }
+  }
   //  Stream s(stdout);
   //  s << "\n\nBefore:\n";
   //  Dump (&s, Address::DumpStyleFileAddress);