[clang-format] Never analyze insert/remove braces in the same pass

[owenpan]

Summary

Turn off RemoveBracesLLVM while analyzing InsertBraces and vice versa to avoid potential interference of each other and better the performance.

clang/lib/Format/Format.cpp

FormatStyle::GetLanguageStyle(FormatStyle::LanguageKind Language) const {
   return StyleSet.Get(Language);
 }
 
 namespace {
 
 class BracesInserter : public TokenAnalyzer {
 public:
   BracesInserter(const Environment &Env, const FormatStyle &Style)
-      : TokenAnalyzer(Env, Style) {}
+      : TokenAnalyzer(Env, Style) {
+    this->Style.RemoveBracesLLVM = false;
+  }
 
   std::pair<tooling::Replacements, unsigned>
   analyze(TokenAnnotator &Annotator,
           SmallVectorImpl<AnnotatedLine *> &AnnotatedLines,
           FormatTokenLexer &Tokens) override {
     AffectedRangeMgr.computeAffectedLines(AnnotatedLines);
     tooling::Replacements Result;
     insertBraces(AnnotatedLines, Result);
for (AnnotatedLine *Line : Lines) {
       }
     }
   }
 };
 
 class BracesRemover : public TokenAnalyzer {
 public:
   BracesRemover(const Environment &Env, const FormatStyle &Style)
-      : TokenAnalyzer(Env, Style) {}
+      : TokenAnalyzer(Env, Style) {
+    this->Style.InsertBraces = false;
+  }
 
   std::pair<tooling::Replacements, unsigned>
   analyze(TokenAnnotator &Annotator,
           SmallVectorImpl<AnnotatedLine *> &AnnotatedLines,
           FormatTokenLexer &Tokens) override {
     AffectedRangeMgr.computeAffectedLines(AnnotatedLines);
     tooling::Replacements Result;
     removeBraces(AnnotatedLines, Result);