fix issue 97463 using change suggested by nbdd0121.

parameterized on target details to decide value-extension policy on calls, in order to address how Apple's aarch64 ABI differs from that on Linux and Windows.

Updated to incorporate review feedback: adjust comment on new enum specifying
param extension policy.

Updated to incorporate review feedback: shorten enum names and those of its
variants to make it less unwieldy.

placate tidy.

compiler/rustc_target/src/spec/mod.rs

@@ -1250,6 +1250,8 @@ pub struct TargetOptions {
     pub abi_return_struct_as_int: bool,
     /// Whether the target toolchain is like macOS's. Only useful for compiling against iOS/macOS,
     /// in particular running dsymutil and some other stuff like `-dead_strip`. Defaults to false.
+    /// Also indiates whether to use Apple-specific ABI changes, such as extending function
+    /// parameters to 32-bits.
     pub is_like_osx: bool,
     /// Whether the target toolchain is like Solaris's.
     /// Only useful for compiling against Illumos/Solaris,