go/analysis/passes/printf: create printf pass

This is a straight rename to simplify review of the actual change in a
follow-up CL. (This is a workaround for git diff's weak support for
renames.)

Change-Id: If63336d4f782e12066fce83a848465371013cdde
Reviewed-on: https://go-review.googlesource.com/c/142237
Reviewed-by: Michael Matloob <matloob@golang.org>
Run-TryBot: Michael Matloob <matloob@golang.org>
diff --git a/go/analysis/passes/vet/print.go b/go/analysis/printf/printf.go
similarity index 100%
rename from go/analysis/passes/vet/print.go
rename to go/analysis/printf/printf.go
diff --git a/go/analysis/passes/vet/testdata/print.go b/go/analysis/printf/testdata/src/a/a.go
similarity index 100%
rename from go/analysis/passes/vet/testdata/print.go
rename to go/analysis/printf/testdata/src/a/a.go