[lld] [LLD] Implement --enable-non-contiguous-regions (PR #90007)

[Fangrui Song via llvm-commits]

================
@@ -48,7 +48,7 @@ template <class ELFT> struct RelsOrRelas {
 // sections.
 class SectionBase {
 public:
-  enum Kind { Regular, Synthetic, EHFrame, Merge, Output };
+  enum Kind { Regular, Synthetic, EHFrame, Merge, Output, Spill };
----------------
MaskRay wrote:

`Regular, Synthetic, Spill, EHFrame, Merge, Output` may be more efficient.

https://github.com/llvm/llvm-project/pull/90007