Verify that the instruction encoding matches what the ISA would encode.

Fixes #69

cranelift/src/filetest/runone.rs

@@ -116,7 +116,7 @@ fn run_one_test<'a>(tuple: (&'a SubTest, &'a Flags, Option<&'a TargetIsa>),
 
     // Should we run the verifier before this test?
     if !context.verified && test.needs_verifier() {
-        verify_function(&func).map_err(|e| pretty_verifier_error(&func, e))?;
+        verify_function(&func, isa).map_err(|e| pretty_verifier_error(&func, e))?;
         context.verified = true;
     }
 

cranelift/src/filetest/verifier.rs

@@ -51,7 +51,7 @@ impl SubTest for TestVerifier {
             }
         }
 
-        match verify_function(func) {
+        match verify_function(func, context.isa) {
             Ok(_) => {
                 match expected {
                     None => Ok(()),