Support 16-bit targets in get_pointer_width

[varkor]

rust/src/tools/compiletest/src/util.rs

Lines 103 to 109 in 4bb5d35

	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:

rust/src/test/ui/precise_pointer_size_matching.rs

Lines 1 to 6 in 4bb5d35

	// 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"

[Centril]

cc @pnkfelix

[eddyb]

rust/src/tools/compiletest/src/util.rs

Line 104 in 4bb5d35

if (triple.contains("64") && !triple.ends_with("gnux32")) || triple.starts_with("s390x") {

That's very fragile, it should've used rustc --print=cfg instead (or --print=target-spec-json and parse the output as JSON).
cc @nikomatsakis @kennytm

[kadiwa4]

No longer relevant since #100260.