Revert "Revert "cmd/vet/all: remove pprof from the whitelist""

This reverts commit 9bd1cc3f.

Reason for revert: New fixes in from upstream. Try this again.

Change-Id: Iea46f32857e8467f8d5a49b31e20a52fda8bce60
Reviewed-on: https://go-review.googlesource.com/37693Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/cmd/vet/all/main.go

@@ -182,9 +182,6 @@ var ignorePathPrefixes = [...]string{
 	"cmd/go/testdata/",
 	"cmd/vet/testdata/",
 	"go/printer/testdata/",
-	// Ignore pprof for the moment to get the builders happy.
-	// TODO: Fix all the issues and reinstate.
-	"cmd/vendor/github.com/google/pprof",
 }
 
 func vetPlatforms(pp []platform) {