Use preserve_mostcc for extern "rust-cold"

As experimentation in 115242 has shown looks better than `coldcc`.

And *don't* use a different convention for cold on Windows, because that actually ends up making things worse.

cc tracking issue 97544

compiler/rustc_target/src/json.rs

@@ -96,7 +96,9 @@ impl ToJson for crate::abi::call::Conv {
         let s = match self {
             Self::C => "C",
             Self::Rust => "Rust",
-            Self::RustCold => "RustCold",
+            Self::Cold => "Cold",
+            Self::PreserveMost => "PreserveMost",
+            Self::PreserveAll => "PreserveAll",
             Self::ArmAapcs => "ArmAapcs",
             Self::CCmseNonSecureCall => "CCmseNonSecureCall",
             Self::Msp430Intr => "Msp430Intr",