TargetIsa implies a Display of shared and isa-specific flags

lib/cretonne/src/isa/intel/mod.rs

@@ -15,6 +15,7 @@ use ir;
 use regalloc;
 use result;
 use timing;
+use std::fmt;
 
 
 #[allow(dead_code)]
@@ -116,3 +117,9 @@ impl TargetIsa for Isa {
         abi::prologue_epilogue(func, self)
     }
 }
+
+impl fmt::Display for Isa {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}\n{}", self.shared_flags, self.isa_flags)
+    }
+}