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Support 16-bit targets in get_pointer_width #56567

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@varkor

pub fn get_pointer_width(triple: &str) -> &'static str {
if (triple.contains("64") && !triple.ends_with("gnux32")) || triple.starts_with("s390x") {
"64bit"
} else {
"32bit"
}
}

We should also support "16bit" here.

Once that's supported, the precise_pointer_matching test can be updated:

// normalize-stderr-32bit: "-2147483648isize" -> "$$ISIZE_MIN"
// normalize-stderr-64bit: "-9223372036854775808isize" -> "$$ISIZE_MIN"
// normalize-stderr-32bit: "2147483647isize" -> "$$ISIZE_MAX"
// normalize-stderr-64bit: "9223372036854775807isize" -> "$$ISIZE_MAX"
// normalize-stderr-32bit: "4294967295usize" -> "$$USIZE_MAX"
// normalize-stderr-64bit: "18446744073709551615usize" -> "$$USIZE_MAX"

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