cmd/vet: update for new number formats [1.13 backport]

[gopherbot]

@ianlancetaylor requested issue #29986 to be considered for backport to the next 1.13 minor release.

@gopherbot Please open backport issues for 1.13 and 1.14

"go vet" should permit %O in fmt.Printf formats, as the formatting code was added in the 1.13 release.

[dmitshur]

Approving for 1.14 (#39288) and 1.13 (this issue). This is a serious problem affecting valid Go code with no workaround.

[dmitshur]

I've described the mechanics to perform this backport in full detail in #29986 (comment).

For the 1.13 backport, we need to:

• first, reset the release-branch.go1.13 branch in x/tools to the correct revision, then
• backport CL 202041 into release-branch.go1.13 in x/tools,
• backport CL 203798 into release-branch.go1.13 in x/tools,
• backport CL 235100 into release-branch.go1.13 in x/tools,
• finally, re-vendor the latest x/tools release-branch.go1.13 branch in the cmd module.

[gopherbot]

Change https://golang.org/cl/237942 mentions this issue: [release-branch.go1.13] go/analysis/passes/printf: allow %x/%X for float/complex types

[gopherbot]

Change https://golang.org/cl/237945 mentions this issue: [release-branch.go1.13] go/analysis/passes/printf: allow %O in format strings

[gopherbot]

Change https://golang.org/cl/237944 mentions this issue: [release-branch.go1.13] go/analysis/passes/printf: allow # for b flag

[gopherbot]

Closed by merging 03eb5928a63b2227d996a7cc2ef45de5f335189e to release-branch.go1.13.