Add methods for checking for full ranges to Scalar and WrappingRange

Move *_max methods back to util

change to inline instead of inline(always)

Remove valid_range_exclusive from scalar
Use WrappingRange instead

implement always_valid_for in a safer way

Fix accidental edit

compiler/rustc_codegen_llvm/src/abi.rs

@@ -541,11 +541,8 @@ impl<'tcx> FnAbiLlvmExt<'tcx> for FnAbi<'tcx, Ty<'tcx>> {
             // 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() {
-                    let range = scalar.valid_range_exclusive(bx);
-                    if range.start != range.end {
-                        bx.range_metadata(callsite, range);
-                    }
+                if !scalar.is_bool() && !scalar.is_always_valid_for(bx) {
+                    bx.range_metadata(callsite, &scalar.valid_range);
                 }
             }
         }