inline: make it possible to gob encode/decode inlineMeFacts

Before this change gob encoding of these facts was failing with:

  `gob: type analyzer.inlineMeFact has no exported fields`

gob encoding is required for all facts as analyzer drivers use it to
share facts between the analysis of different packages as stated in
the docs:

  A Fact type must be a pointer. Facts are encoded and decoded using
  encoding/gob. A Fact may implement the GobEncoder/GobDecoder
  interfaces to customize its encoding. Fact encoding should not fail.

Change-Id: Ifb0eb57b0f582ec228a21a0d17e3bbd33c560d3d
Reviewed-on: https://go-review.googlesource.com/c/tools/+/574435
Auto-Submit: Lasse Folger <lassefolger@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Alan Donovan <adonovan@google.com>

internal/refactor/inline/analyzer/analyzer.go

@@ -104,7 +104,7 @@ func run(pass *analysis.Pass) (interface{}, error) {
 			if !ok {
 				var fact inlineMeFact
 				if pass.ImportObjectFact(fn, &fact) {
-					callee = fact.callee
+					callee = fact.Callee
 					inlinable[fn] = callee
 				}
 			}
@@ -157,9 +157,9 @@ func run(pass *analysis.Pass) (interface{}, error) {
 	return nil, nil
 }
 
-type inlineMeFact struct{ callee *inline.Callee }
+type inlineMeFact struct{ Callee *inline.Callee }
 
-func (f *inlineMeFact) String() string { return "inlineme " + f.callee.String() }
+func (f *inlineMeFact) String() string { return "inlineme " + f.Callee.String() }
 func (*inlineMeFact) AFact()           {}
 
 func discard(string, ...any) {}