moved crates in lib/ to src/, renamed crates, modified some files' text (#660)

moved crates in lib/ to src/, renamed crates, modified some files' text (#660)

cranelift/codegen/src/isa/arm64/abi.rs

@@ -0,0 +1,30 @@
+//! ARM 64 ABI implementation.
+
+use super::registers::{FPR, GPR};
+use crate::ir;
+use crate::isa::RegClass;
+use crate::regalloc::RegisterSet;
+use crate::settings as shared_settings;
+
+/// Legalize `sig`.
+pub fn legalize_signature(
+    _sig: &mut ir::Signature,
+    _flags: &shared_settings::Flags,
+    _current: bool,
+) {
+    unimplemented!()
+}
+
+/// Get register class for a type appearing in a legalized signature.
+pub fn regclass_for_abi_type(ty: ir::Type) -> RegClass {
+    if ty.is_int() {
+        GPR
+    } else {
+        FPR
+    }
+}
+
+/// Get the set of allocatable registers for `func`.
+pub fn allocatable_registers(_func: &ir::Function) -> RegisterSet {
+    unimplemented!()
+}