Rollup merge of #136167 - pitaj:new_range, r=Nadrieril

Implement unstable `new_range` feature

Switches `a..b`, `a..`, and `a..=b` to resolve to the new range types.

For rust-lang/rfcs#3550
Tracking issue #123741

also adds the re-export that was missed in the original implementation of `new_range_api`

compiler/rustc_span/src/symbol.rs

@@ -294,9 +294,12 @@ symbols! {
         ProceduralMasqueradeDummyType,
         Range,
         RangeBounds,
+        RangeCopy,
         RangeFrom,
+        RangeFromCopy,
         RangeFull,
         RangeInclusive,
+        RangeInclusiveCopy,
         RangeTo,
         RangeToInclusive,
         Rc,
@@ -1364,6 +1367,7 @@ symbols! {
         new_lower_hex,
         new_octal,
         new_pointer,
+        new_range,
         new_unchecked,
         new_upper_exp,
         new_upper_hex,