Make abi::Abi Copy and remove a *lot* of refs

fix

fix

Remove more refs and clones

fix

more

fix

compiler/rustc_codegen_llvm/src/abi.rs

@@ -536,13 +536,13 @@ impl<'tcx> FnAbiLlvmExt<'tcx> for FnAbi<'tcx, Ty<'tcx>> {
             }
             _ => {}
         }
-        if let abi::Abi::Scalar(ref scalar) = self.ret.layout.abi {
+        if let abi::Abi::Scalar(scalar) = self.ret.layout.abi {
             // If the value is a boolean, the range is 0..2 and that ultimately
             // become 0..0 when the type becomes i1, which would be rejected
             // by the LLVM verifier.
             if let Int(..) = scalar.value {
                 if !scalar.is_bool() && !scalar.is_always_valid_for(bx) {
-                    bx.range_metadata(callsite, &scalar.valid_range);
+                    bx.range_metadata(callsite, scalar.valid_range);
                 }
             }
         }