cmd/go/internal/modload: address issues missed in CL 244774

For #36460

Change-Id: I5e9a42d64e36679b881e96145833e66cf77b98a5
Reviewed-on: https://go-review.googlesource.com/c/go/+/250338
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Matloob <matloob@golang.org>

src/cmd/go/internal/modload/modfile.go

@@ -345,7 +345,7 @@ type retraction struct {
 
 // goModSummary returns a summary of the go.mod file for module m,
 // taking into account any replacements for m, exclusions of its dependencies,
-// and or vendoring.
+// and/or vendoring.
 //
 // goModSummary cannot be used on the Target module, as its requirements
 // may change.
@@ -405,7 +405,7 @@ func goModSummary(m module.Version) (*modFileSummary, error) {
 				return cached{nil, module.VersionError(actual, errors.New("parsing go.mod: missing module line"))}
 			}
 
-			// In theory we should only allow mpath to be unequal to mod.Path here if the
+			// In theory we should only allow mpath to be unequal to m.Path here if the
 			// version that we fetched lacks an explicit go.mod file: if the go.mod file
 			// is explicit, then it should match exactly (to ensure that imports of other
 			// packages within the module are interpreted correctly). Unfortunately, we

src/cmd/go/internal/modload/mvs.go

@@ -14,7 +14,6 @@ import (
 
 	"cmd/go/internal/modfetch"
 	"cmd/go/internal/mvs"
-	"cmd/go/internal/par"
 
 	"golang.org/x/mod/module"
 	"golang.org/x/mod/semver"
@@ -24,7 +23,6 @@ import (
 // with any exclusions or replacements applied internally.
 type mvsReqs struct {
 	buildList []module.Version
-	cache     par.Cache // module.Version → Required method results
 }
 
 // Reqs returns the current module requirement graph.