[llvm] [x64][win] Windows x64 unwind v3: Use tail-relative epilog offsets and add size-based splitting (PR #203108)

[Mikołaj Piróg via llvm-commits]

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@@ -138,6 +166,12 @@ FuncletInfo X86WinEHUnwindV3::analyzeFunclet(MachineFunction &MF,
       break;
 
     for (MachineInstr &MI : MBB) {
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mikolaj-pirog wrote:

I think it would be worth to have some debug dumps of instructions counted, spliting decisions ("Spliting epilog n due to ...)

https://github.com/llvm/llvm-project/pull/203108