[clang-format] Address fixme

[owenpan]

Looks okay.

clang/lib/Format/UnwrappedLineParser.cpp

3037–3045

Nit: elide braces.

[HazardyKnusperkeks]

Dropped braces.

[MyDeveloperDay]

LGTM

clang/lib/Format/TokenAnnotator.h

AnnotatedLine(const UnwrappedLine &Line)
         FirstStartColumn(Line.FirstStartColumn) {
     assert(!Line.Tokens.empty());
 
     // Calculate Next and Previous for all tokens. Note that we must overwrite
     // Next and Previous for every token, as previous formatting runs might have
     // left them in a different state.
     First->Previous = nullptr;
     FormatToken *Current = First;
-    for (std::list<UnwrappedLineNode>::const_iterator I = ++Line.Tokens.begin(),
-                                                      E = Line.Tokens.end();
-         I != E; ++I) {
+    for (auto I = ++Line.Tokens.begin(), E = Line.Tokens.end(); I != E; ++I) {
       const UnwrappedLineNode &Node = *I;
       Current->Next = I->Tok;
       I->Tok->Previous = Current;
       Current = Current->Next;
       Current->Children.clear();
       for (const auto &Child : Node.Children) {
         Children.push_back(new AnnotatedLine(Child));
         Current->Children.push_back(Children.back());

clang/lib/Format/UnwrappedLineParser.h

 
 #ifndef LLVM_CLANG_LIB_FORMAT_UNWRAPPEDLINEPARSER_H
 #define LLVM_CLANG_LIB_FORMAT_UNWRAPPEDLINEPARSER_H
 
 #include "FormatToken.h"
 #include "clang/Basic/IdentifierTable.h"
 #include "clang/Format/Format.h"
 #include "llvm/Support/Regex.h"
-#include <list>
 #include <stack>
+#include <vector>
 
 namespace clang {
 namespace format {
 
 struct UnwrappedLineNode;
 
 /// An unwrapped line is a sequence of \c Token, that we would like to
 /// put on a single line if there was no column limit.
 ///
 /// This is used as a main interface between the \c UnwrappedLineParser and the
 /// \c UnwrappedLineFormatter. The key property is that changing the formatting
 /// within an unwrapped line does not affect any other unwrapped lines.
 struct UnwrappedLine {
   UnwrappedLine();
 
-  // FIXME: Don't use std::list here.
   /// The \c Tokens comprising this \c UnwrappedLine.
-  std::list<UnwrappedLineNode> Tokens;
+  std::vector<UnwrappedLineNode> Tokens;
 
   /// The indent level of the \c UnwrappedLine.
   unsigned Level;
 
   /// Whether this \c UnwrappedLine is part of a preprocessor directive.
   bool InPPDirective;
 
   bool MustBeDeclaration;

clang/lib/Format/UnwrappedLineParser.cpp

void UnwrappedLineParser::parseStatementMacro() {
   addUnwrappedLine();
 }
 
 LLVM_ATTRIBUTE_UNUSED static void printDebugInfo(const UnwrappedLine &Line,
                                                  StringRef Prefix = "") {
   llvm::dbgs() << Prefix << "Line(" << Line.Level
                << ", FSC=" << Line.FirstStartColumn << ")"
                << (Line.InPPDirective ? " MACRO" : "") << ": ";
-  for (std::list<UnwrappedLineNode>::const_iterator I = Line.Tokens.begin(),
-                                                    E = Line.Tokens.end();
-       I != E; ++I) {
-    llvm::dbgs() << I->Tok->Tok.getName() << "["
-                 << "T=" << (unsigned)I->Tok->getType()
-                 << ", OC=" << I->Tok->OriginalColumn << "] ";
-  }
-  for (std::list<UnwrappedLineNode>::const_iterator I = Line.Tokens.begin(),
-                                                    E = Line.Tokens.end();
-       I != E; ++I) {
-    const UnwrappedLineNode &Node = *I;
-    for (SmallVectorImpl<UnwrappedLine>::const_iterator
-             I = Node.Children.begin(),
-             E = Node.Children.end();
-         I != E; ++I) {
-      printDebugInfo(*I, "\nChild: ");
-    }
-  }
+  for (const auto &Node : Line.Tokens) {
+    llvm::dbgs() << Node.Tok->Tok.getName() << "["
+                 << "T=" << static_cast<unsigned>(Node.Tok->getType())
+                 << ", OC=" << Node.Tok->OriginalColumn << "] ";
+  }
+  for (const auto &Node : Line.Tokens)
+    for (const auto &ChildNode : Node.Children)
+      printDebugInfo(ChildNode, "\nChild: ");
+
   llvm::dbgs() << "\n";
 }
 
 void UnwrappedLineParser::addUnwrappedLine(LineLevel AdjustLevel) {
   if (Line->Tokens.empty())
     return;
   LLVM_DEBUG({
     if (CurrentLines == &Lines)