[SILOptimizer] Exclude a test from 32bit targets (#88076)
`SILOptimizer/constant_capture_propagation_odr.sil` introduced in
https://github.com/swiftlang/swift/pull/87916 assumed it will run on
64bit targets, as a result, lines like `%3 = struct $Int (%2 :
$Builtin.Int64)` is automatically invalid on 32bit targets.
This change adds `REQUIRES: PTRSIZE=64` to exclude the sil test from
32bit targets. The functionality can still be tested through
`constant_capture_propagation_odr.swift`.
