[llvm] [JITLink][LoongArch] Support large code model (PR #155566)

[Lu Weining via llvm-commits]

================
@@ -161,6 +161,17 @@ enum EdgeKind_loongarch : Edge::Kind {
   ///
   Page20,
 
+  /// The signed 20-bit delta from the fixup page to the page containing the
+  /// target for 64-bit addresses.
+  ///
+  /// Fixup expression:
+  ///   Fixup <- getLoongArchPageDelta(Target + Addend, FixupAddress, Kind)
----------------
SixWeining wrote:

```suggestion
  ///   Fixup <- getLoongArchPageDelta(Target + Addend, Fixup, Kind)[51:32] : int20
```

https://github.com/llvm/llvm-project/pull/155566