Update the remaining comments in Frontend to 'expansion'.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@135150 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/clang/Frontend/DiagnosticOptions.h b/include/clang/Frontend/DiagnosticOptions.h
index 56093c3..5ae8eb3 100644
--- a/include/clang/Frontend/DiagnosticOptions.h
+++ b/include/clang/Frontend/DiagnosticOptions.h
@@ -49,8 +49,7 @@
                                  /// input source file.
 
   unsigned ErrorLimit;           /// Limit # errors emitted.
-  unsigned MacroBacktraceLimit;  /// Limit depth of macro instantiation 
-                                 /// backtrace.
+  unsigned MacroBacktraceLimit;  /// Limit depth of macro expansion backtrace.
   unsigned TemplateBacktraceLimit; /// Limit depth of instantiation backtrace.
 
   /// The distance between tab stops.
diff --git a/include/clang/Frontend/PreprocessorOptions.h b/include/clang/Frontend/PreprocessorOptions.h
index 8856805..2e16c97 100644
--- a/include/clang/Frontend/PreprocessorOptions.h
+++ b/include/clang/Frontend/PreprocessorOptions.h
@@ -48,7 +48,7 @@
 
   unsigned DetailedRecord : 1; /// Whether we should maintain a detailed
                                /// record of all macro definitions and
-                               /// instantiations.
+                               /// expansions.
   
   /// \brief Whether the detailed preprocessing record includes nested macro 
   /// expansions.
diff --git a/lib/Frontend/PrintPreprocessedOutput.cpp b/lib/Frontend/PrintPreprocessedOutput.cpp
index b9c0642..c892960 100644
--- a/lib/Frontend/PrintPreprocessedOutput.cpp
+++ b/lib/Frontend/PrintPreprocessedOutput.cpp
@@ -196,7 +196,7 @@
     if (LineNo-CurLine == 1)
       OS << '\n';
     else if (LineNo == CurLine)
-      return false;    // Spelling line moved, but instantiation line didn't.
+      return false;    // Spelling line moved, but expansion line didn't.
     else {
       const char *NewLines = "\n\n\n\n\n\n\n\n";
       OS.write(NewLines, LineNo-CurLine);
@@ -410,7 +410,7 @@
 /// is called for the first token on each new line.  If this really is the start
 /// of a new logical line, handle it and return true, otherwise return false.
 /// This may not be the start of a logical line because the "start of line"
-/// marker is set for spelling lines, not instantiation ones.
+/// marker is set for spelling lines, not expansion ones.
 bool PrintPPOutputPPCallbacks::HandleFirstTokOnLine(Token &Tok) {
   // Figure out what line we went to and insert the appropriate number of
   // newline characters.