Add --build-summary-only-diet option.

pkg/analyzer_cli/lib/src/build_mode.dart

Index: pkg/analyzer_cli/lib/src/build_mode.dart
diff --git a/pkg/analyzer_cli/lib/src/build_mode.dart b/pkg/analyzer_cli/lib/src/build_mode.dart
index a2c921881175b9269f0c1886bb6a985b612e4703..4111aefabb9099319a2c76f03f12da700d6735ea 100644
--- a/pkg/analyzer_cli/lib/src/build_mode.dart
+++ b/pkg/analyzer_cli/lib/src/build_mode.dart
@@ -145,7 +145,11 @@ class BuildMode {
 
     // Set context options.
     Driver.setAnalysisContextOptions(
-        context, options, (AnalysisOptionsImpl contextOptions) {});
+        context, options, (AnalysisOptionsImpl contextOptions) {
+      if (options.buildSummaryOnlyDiet) {
+        contextOptions.analyzeFunctionBodies = false;
+      }
+    });
 
     // Configure using summaries.
     context.typeProvider = sdk.context.typeProvider;