Dumped code from the wasm2cretonne repo.

Integrated wasm test suite translation as cretonne test

Fixes #146.
Fixes #143.

cranelift/wasmtests/globals.wast

@@ -0,0 +1,8 @@
+(module
+  (global $x (mut i32) (i32.const 4))
+  (memory 1)
+  (func $main (local i32)
+    (i32.store (i32.const 0) (get_global $x))
+  )
+  (start $main)
+)