[ELF] findOrphanPos: avoid redundant getRankProximity call. NFC

Author: MaskRay

lld/ELF/Writer.cpp

@@ -936,17 +936,22 @@ findOrphanPos(SmallVectorImpl<SectionCommand *>::iterator b,
   }
 
   // Find the first element that has as close a rank as possible.
-  auto i = std::max_element(b, e, [=](SectionCommand *a, SectionCommand *b) {
-    return getRankProximity(sec, a) < getRankProximity(sec, b);
-  });
-  if (i == e)
+  if (b == e)
     return e;
+  int proximity = getRankProximity(sec, *b);
+  auto i = b;
+  for (auto j = b; ++j != e;) {
+    int p = getRankProximity(sec, *j);
+    if (p > proximity) {
+      proximity = p;
+      i = j;
+    }
+  }
   if (!isa<OutputDesc>(*i))
     return e;
   auto foundSec = &cast<OutputDesc>(*i)->osec;
 
   // Consider all existing sections with the same proximity.
-  int proximity = getRankProximity(sec, *i);
   unsigned sortRank = sec->sortRank;
   if (script->hasPhdrsCommands() || !script->memoryRegions.empty())
     // Prevent the orphan section to be placed before the found section. If