include comments on SPI symbols when they're in symbol graphs

lib/Frontend/CompilerInvocation.cpp

@@ -18,6 +18,7 @@
 #include "swift/Option/Options.h"
 #include "swift/Option/SanitizerOptions.h"
 #include "swift/Strings.h"
+#include "swift/SymbolGraphGen/SymbolGraphOptions.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/Triple.h"
 #include "llvm/Option/Arg.h"
@@ -1019,6 +1020,28 @@ static bool ParseClangImporterArgs(ClangImporterOptions &Opts,
   return false;
 }
 
+static void ParseSymbolGraphArgs(symbolgraphgen::SymbolGraphOptions &Opts,
+                                 ArgList &Args,
+                                 DiagnosticEngine &Diags,
+                                 LangOptions &LangOpts) {
+  using namespace options;
+
+  if (const Arg *A = Args.getLastArg(OPT_emit_symbol_graph_dir)) {
+    Opts.OutputDir = A->getValue();
+  }
+
+  Opts.Target = LangOpts.Target;
+
+  Opts.SkipInheritedDocs = Args.hasArg(OPT_skip_inherited_docs);
+  Opts.IncludeSPISymbols = Args.hasArg(OPT_include_spi_symbols);
+
+  // default values for generating symbol graphs during a build
+  Opts.MinimumAccessLevel = AccessLevel::Public;
+  Opts.PrettyPrint = false;
+  Opts.EmitSynthesizedMembers = true;
+  Opts.PrintMessages = false;
+}
+
 static bool ParseSearchPathArgs(SearchPathOptions &Opts,
                                 ArgList &Args,
                                 DiagnosticEngine &Diags,
@@ -1973,6 +1996,8 @@ bool CompilerInvocation::parseArgs(
     return true;
   }
 
+  ParseSymbolGraphArgs(SymbolGraphOpts, ParsedArgs, Diags, LangOpts);
+
   if (ParseSearchPathArgs(SearchPathOpts, ParsedArgs, Diags,
                           workingDirectory)) {
     return true;