[MC] [Win64EH] Simplify code using WinEH::Instruction::operator!=. NFC.

[mstorsjo]

Summary

operator== and operator!= were added in
1308bb99e06752ab0b5175c92da31083f91af921 / D87369, but this existing
codepath wasn't updated to use them.

Also fix the indentation of the enclosed liens.

[rnk]

lgtm

llvm/lib/MC/MCWin64EH.cpp

assert(InstrsIter != info->EpilogMap.end() &&
            "Epilog not found in EpilogMap");
     const auto &Instrs = InstrsIter->second;
 
     if (Instrs.size() != EpilogInstrs.size())
       continue;
 
     bool Match = true;
     for (unsigned i = 0; i < Instrs.size(); ++i)
-      if (Instrs[i].Operation != EpilogInstrs[i].Operation ||
-          Instrs[i].Offset != EpilogInstrs[i].Offset ||
-          Instrs[i].Register != EpilogInstrs[i].Register) {
-         Match = false;
-         break;
+      if (Instrs[i] != EpilogInstrs[i]) {
       }
 
     if (Match)
       return EpilogStart;
   }
   return nullptr;
 }