cmd/vet: eliminate "might be too small" shift warnings #19321
Description
func f(i int) int {
return i >> 32
}vet warns that i might be too small for a shift of 32. This happens for all machine-dependent types: int, uint, uintptr. This is a significant source of false positives in the standard library. We should instead look at the actual size on the platform being vetted, and complain definitively or not at all.
Related: #18085