ELF: Rename relocNeedsCopy -> needsCopyRel

Just "copy" was a bit too ambiguous to say about copy relocations.

llvm-svn: 255866
diff --git a/lld/ELF/Writer.cpp b/lld/ELF/Writer.cpp
index cae1f20..522eb62 100644
--- a/lld/ELF/Writer.cpp
+++ b/lld/ELF/Writer.cpp
@@ -245,7 +245,7 @@
       if (auto *E = dyn_cast<SharedSymbol<ELFT>>(Body)) {
         if (E->NeedsCopy)
           continue;
-        if (Target->relocNeedsCopy(Type, *Body))
+        if (Target->needsCopyRel(Type, *Body))
           E->NeedsCopy = true;
       }
       NeedsPlt = Target->relocNeedsPlt(Type, *Body);