[release-branch.go1.19] cmd/pprof: skip TestDisasm on ARM64

[release-branch.go1.19] cmd/pprof: skip TestDisasm on ARM64

The test is fixed at tip, but it is non-trivial enough to backport
to (potentionally the last) Go 1.19 minor release. Skip the test.

Fixes #60637.

Change-Id: I0425b703a5270b680346b63ab38c47b890a3a3bf
Reviewed-on: https://go-review.googlesource.com/c/go/+/501824
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Dmitri Shuralyov <dmitshur@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>