Re-export common types in the cretonne::ir module.

Clients should not have to navigate the ir sub-modules to find commonly used
types.

cranelift/src/libcretonne/ir/instructions.rs

@@ -10,10 +10,11 @@ use std::fmt::{self, Display, Formatter};
 use std::str::FromStr;
 use std::ops::{Deref, DerefMut};
 
-use ir::entities::*;
-use ir::immediates::*;
+use ir::{Value, Type, Ebb, JumpTable};
+use ir::entities::NO_VALUE;
+use ir::immediates::{Imm64, Ieee32, Ieee64};
 use ir::condcodes::*;
-use ir::types::{self, Type};
+use ir::types;
 
 // Include code generated by `meta/gen_instr.py`. This file contains:
 //