Rename the 'cretonne' crate to 'cretonne-codegen'.

This fixes the next part of #287.

lib/codegen/src/lib.rs

@@ -0,0 +1,84 @@
+//! Cretonne code generation library.
+
+#![deny(missing_docs, trivial_numeric_casts, unused_extern_crates)]
+#![cfg_attr(feature = "clippy", plugin(clippy(conf_file = "../../clippy.toml")))]
+#![cfg_attr(feature="cargo-clippy", allow(
+// Rustfmt 0.9.0 is at odds with this lint:
+                block_in_if_condition_stmt,
+// Produces only a false positive:
+                while_let_loop,
+// Produces many false positives, but did produce some valid lints, now fixed:
+                needless_lifetimes,
+// Generated code makes some style transgressions, but readability doesn't suffer much:
+                many_single_char_names,
+                identity_op,
+                needless_borrow,
+                cast_lossless,
+                unreadable_literal,
+                assign_op_pattern,
+                empty_line_after_outer_attr,
+// Hard to avoid in generated code:
+                cyclomatic_complexity,
+                too_many_arguments,
+// Code generator doesn't have a way to collapse identical arms:
+                match_same_arms,
+// These are relatively minor style issues, but would be easy to fix:
+                new_without_default,
+                new_without_default_derive,
+                should_implement_trait,
+                redundant_field_names,
+                useless_let_if_seq,
+                len_without_is_empty))]
+
+pub use context::Context;
+pub use legalizer::legalize_function;
+pub use verifier::verify_function;
+pub use write::write_function;
+
+/// Version number of the cretonne-codegen crate.
+pub const VERSION: &str = env!("CARGO_PKG_VERSION");
+
+#[macro_use]
+pub extern crate cretonne_entity as entity;
+
+#[macro_use]
+pub mod dbg;
+
+pub mod bforest;
+pub mod binemit;
+pub mod cfg_printer;
+pub mod cursor;
+pub mod dominator_tree;
+pub mod flowgraph;
+pub mod ir;
+pub mod isa;
+pub mod loop_analysis;
+pub mod print_errors;
+pub mod result;
+pub mod settings;
+pub mod timing;
+pub mod verifier;
+
+pub use entity::packed_option;
+
+mod abi;
+mod bitset;
+mod constant_hash;
+mod context;
+mod dce;
+mod divconst_magic_numbers;
+mod iterators;
+mod legalizer;
+mod licm;
+mod partition_slice;
+mod postopt;
+mod predicates;
+mod preopt;
+mod ref_slice;
+mod regalloc;
+mod scoped_hash_map;
+mod simple_gvn;
+mod stack_layout;
+mod topo_order;
+mod unreachable_code;
+mod write;