File stale path references.

After rearranging the directory layout, some paths in documentation
needed updating.

Fix some typos too.

lib/cretonne/src/ir/builder.rs

@@ -39,7 +39,7 @@ pub trait InstBuilderBase<'f>: Sized {
                            -> (Inst, &'f mut DataFlowGraph);
 }
 
-// Include trait code generated by `meta/gen_instr.py`.
+// Include trait code generated by `lib/cretonne/meta/gen_instr.py`.
 //
 // This file defines the `InstBuilder` trait as an extension of `InstBuilderBase` with methods per
 // instruction format and per opcode.

lib/cretonne/src/ir/instructions.rs

@@ -15,7 +15,7 @@ use ir::immediates::{Imm64, Uimm8, Ieee32, Ieee64, ImmVector};
 use ir::condcodes::*;
 use ir::types;
 
-// Include code generated by `meta/gen_instr.py`. This file contains:
+// Include code generated by `lib/cretonne/meta/gen_instr.py`. This file contains:
 //
 // - The `pub enum InstructionFormat` enum with all the instruction formats.
 // - The `pub enum Opcode` definition with all known opcodes,
@@ -54,9 +54,9 @@ impl Opcode {
     }
 }
 
-// This trait really belongs in libreader where it is used by the .cton file parser, but since it
+// This trait really belongs in lib/reader where it is used by the .cton file parser, but since it
 // critically depends on the `opcode_name()` function which is needed here anyway, it lives in this
-// module. This also saves us from runing the build script twice to generate code for the two
+// module. This also saves us from running the build script twice to generate code for the two
 // separate crates.
 impl FromStr for Opcode {
     type Err = &'static str;

lib/cretonne/src/ir/types.rs

@@ -30,8 +30,9 @@ pub struct Type(u8);
 /// a SIMD vector.
 pub const VOID: Type = Type(0);
 
-// Include code generated by `meta/gen_types.py`. This file contains constant definitions for all
-// the scalar types as well as common vector types for 64, 128, 256, and 512-bit SIMD vectors.
+// Include code generated by `lib/cretonne/meta/gen_types.py`. This file contains constant
+// definitions for all the scalar types as well as common vector types for 64, 128, 256, and
+// 512-bit SIMD vectors.
 include!(concat!(env!("OUT_DIR"), "/types.rs"));
 
 impl Type {