Separate testing per compiler

tests/compilers/main.rs

@@ -2,11 +2,7 @@
 //! implementation, such as: singlepass, cranelift or llvm depending
 //! on what's available on the target.
 
-#[macro_use]
-mod macros;
 mod imports;
 mod multi_value_imports;
 mod traps;
-mod wast;
-#[macro_use]
-extern crate lazy_static;
+mod utils;