Skip TestBlockProfile

Known flake upstream (https://github.com/golang/go/issues/37844).

Fixed: 82498
Change-Id: I4b69fed2182b785df750b464e02881f0e5c2ca8b
Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/go/+/567681
Fuchsia-Auto-Submit: Tamir Duberstein <tamird@google.com>
Commit-Queue: Auto-Submit <auto-submit@fuchsia-infra.iam.gserviceaccount.com>
Reviewed-by: Devon H. O'Dell <dhobsd@google.com>
diff --git a/src/runtime/pprof/pprof_test.go b/src/runtime/pprof/pprof_test.go
index db1f614..e462089 100644
--- a/src/runtime/pprof/pprof_test.go
+++ b/src/runtime/pprof/pprof_test.go
@@ -650,6 +650,7 @@
 func use(x [8 << 18]byte) {}
 
 func TestBlockProfile(t *testing.T) {
+	t.Skip("TODO(https://github.com/golang/go/issues/37844): known flake")
 	type TestCase struct {
 		name string
 		f    func()