Say "IR" instead of "IL".

While the specifics of these terms are debatable, "IR" generally
isn't incorrect in this context, and is the more widely recognized
term at this time.

See also the discussion in #267.

Fixes #267.

lib/wasm/src/code_translator.rs

@@ -1,5 +1,5 @@
 //! This module contains the bulk of the interesting code performing the translation between
-//! WebAssembly and Cretonne IL.
+//! WebAssembly and Cretonne IR.
 //!
 //! The translation is done in one pass, opcode by opcode. Two main data structures are used during
 //! code translations: the value stack and the control stack. The value stack mimics the execution
@@ -38,7 +38,7 @@ use std::vec::Vec;
 
 // Clippy warns about "flags: _" but its important to document that the flags field is ignored
 #[cfg_attr(feature = "cargo-clippy", allow(unneeded_field_pattern))]
-/// Translates wasm operators into Cretonne IL instructions. Returns `true` if it inserted
+/// Translates wasm operators into Cretonne IR instructions. Returns `true` if it inserted
 /// a return.
 pub fn translate_operator<FE: FuncEnvironment + ?Sized>(
     op: Operator,