cmd/vendor,cmd/pprof: sync pprof@1a94d8640e99

Updated cmd/pprof.objTool.Disasm to accept
an additional bool param introduced in
https://github.com/google/pprof/pull/520 to support
intel syntax in the assembly report.

Returns an error if the intelSyntax param is set. We use
src/cmd/internal/objfile to disassemble and print assembly
so I am not sure if it is relevant, and if so, how.

Fixes #38802
Updates #36905

Change-Id: Iae2b4322404f232196705f05210f00e2495588d9
Reviewed-on: https://go-review.googlesource.com/c/go/+/248499


Trust: Hyang-Ah Hana Kim <hyangah@gmail.com>
Run-TryBot: Hyang-Ah Hana Kim <hyangah@gmail.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>