[meta] Port Instruction/InstructionGroup to the Rust meta crate;

cranelift/codegen/meta/src/cdsl/isa.rs

@@ -1,16 +1,24 @@
-use super::regs::IsaRegs;
-use super::settings::SettingGroup;
+use crate::cdsl::inst::InstructionGroup;
+use crate::cdsl::regs::IsaRegs;
+use crate::cdsl::settings::SettingGroup;
 
 pub struct TargetIsa {
     pub name: &'static str,
+    pub instructions: InstructionGroup,
     pub settings: SettingGroup,
     pub regs: IsaRegs,
 }
 
 impl TargetIsa {
-    pub fn new(name: &'static str, settings: SettingGroup, regs: IsaRegs) -> Self {
+    pub fn new(
+        name: &'static str,
+        instructions: InstructionGroup,
+        settings: SettingGroup,
+        regs: IsaRegs,
+    ) -> Self {
         Self {
             name,
+            instructions,
             settings,
             regs,
         }