debug/macho: invalid dynamic symbol table command can cause panic [1.16 backport]

[gopherbot]

@rolandshoemaker requested issue #48990 to be considered for backport to the next 1.16 minor release.

@gopherbot please open backport issues

[cherrymui]

Approved for backport. Thanks.

[gopherbot]

Change https://golang.org/cl/359454 mentions this issue: [release-branch.go1.16] debug/macho: fail on invalid dynamic symbol table command

[gopherbot]

Closed by merging d19c5bd to release-branch.go1.16.