internal/lsp/cache: disable analysis on dependencies (temporarily)

Right now, we request analyses for files in ParseExported mode, which
doesn't actually produce any meaningful facts. Disable it until we
resolve golang/go#35089, since right now, all this is doing is wasting
memory and CPU.

Change-Id: I6ffb7bdf6c915159b55753b51289cef4bd937603
Reviewed-on: https://go-review.googlesource.com/c/tools/+/208270
Run-TryBot: Rebecca Stambler <rstambler@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>
diff --git a/internal/lsp/cache/analysis.go b/internal/lsp/cache/analysis.go
index 5c206fa..b20dc1a 100644
--- a/internal/lsp/cache/analysis.go
+++ b/internal/lsp/cache/analysis.go
@@ -104,20 +104,26 @@
 		}
 		deps = append(deps, reqActionHandle)
 	}
-	// An analysis that consumes/produces facts
-	// must run on the package's dependencies too.
-	if len(a.FactTypes) > 0 {
-		importIDs := make([]string, 0, len(cph.m.deps))
-		for _, importID := range cph.m.deps {
-			importIDs = append(importIDs, string(importID))
-		}
-		sort.Strings(importIDs) // for determinism
-		for _, importID := range importIDs {
-			depActionHandle, err := s.actionHandle(ctx, packageID(importID), source.ParseExported, a)
-			if err != nil {
-				return nil, err
+
+	// TODO(golang/go#35089): Re-enable this when we doesn't use ParseExported
+	// mode for dependencies. In the meantime, disable analysis for dependencies,
+	// since we don't get anything useful out of it.
+	if false {
+		// An analysis that consumes/produces facts
+		// must run on the package's dependencies too.
+		if len(a.FactTypes) > 0 {
+			importIDs := make([]string, 0, len(cph.m.deps))
+			for _, importID := range cph.m.deps {
+				importIDs = append(importIDs, string(importID))
 			}
-			deps = append(deps, depActionHandle)
+			sort.Strings(importIDs) // for determinism
+			for _, importID := range importIDs {
+				depActionHandle, err := s.actionHandle(ctx, packageID(importID), source.ParseExported, a)
+				if err != nil {
+					return nil, err
+				}
+				deps = append(deps, depActionHandle)
+			}
 		}
 	}