[lld] [LLD] Add CLASS syntax to SECTIONS (PR #95323)

[Fangrui Song via llvm-commits]

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@@ -26,6 +26,14 @@ Non-comprehensive list of changes in this release
 ELF Improvements
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+* Section ``CLASS`` syntax allows binding input section to named classes. This
+  allows the linker to automatically pack the input sections into memory
+  regions by automatically spilling to later class references if a region would
+  overflow. This reduces the toil of manually packing regions (typical for
+  embedded). It also makes full LTO feasible in such cases, since IR merging
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MaskRay wrote:

How is full LTO feasible? I would expect that brief items in release notes have some description in the patch descriotion.

https://github.com/llvm/llvm-project/pull/95323