message: Sort Symbol/CMakeLists.txt
  This makes resolving merge conflicts downstream a tad easier.
diff: @@ -12,22 +12,22 @@ add_lldb_library(lldbSymbol
  ClangExternalASTSourceCallbacks.cpp
  ClangExternalASTSourceCommon.cpp
  ClangUtil.cpp
  + CompactUnwindInfo.cpp
  + CompileUnit.cpp
  CompilerDecl.cpp
  CompilerDeclContext.cpp
  CompilerType.cpp
  - CompileUnit.cpp
  - CompactUnwindInfo.cpp
  + CxxModuleHandler.cpp
  + DWARFCallFrameInfo.cpp
  DebugMacros.cpp
  Declaration.cpp
  - DWARFCallFrameInfo.cpp
  - Function.cpp
  FuncUnwinders.cpp
  + Function.cpp
  LineEntry.cpp
  LineTable.cpp
  LocateSymbolFile.cpp
  ObjectFile.cpp
  PostfixExpression.cpp
  - CxxModuleHandler.cpp
  Symbol.cpp
  SymbolContext.cpp
  SymbolFile.cpp
  