cmd/vet/all: temporarily ignore vendored pprof

Change-Id: I3d96b9803dbbd7184f96240bd7944af919ca1376
Reviewed-on: https://go-review.googlesource.com/37579
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/cmd/vet/all/main.go

@@ -191,6 +191,9 @@ var ignorePathPrefixes = [...]string{
 	// TODO: If vet ever uses go/loader and starts working off source,
 	// this problem will likely go away.
 	"fmt/fmt_test.go",
+	// 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) {