[ELF][PPC64] Use the regular placement for .branch_lt

The currently rule places .branch_lt after .data, which does not make
sense. The original contributor probably wanted to place .branch_lt
before .got/.toc, but failed to notice that .got/.toc are RELRO and
placed earlier.

Remove the special case so that .branch_lt is actually closer to .toc,
alleviating the distance issue.

lld/ELF/Writer.cpp

@@ -941,12 +941,10 @@ static unsigned getSectionRank(const OutputSection &osec) {
     // their coverage by a single signed 16-bit offset from the TOC base
     // pointer.
     StringRef name = osec.name;
-    if (name == ".branch_lt")
+    if (name == ".got")
       rank |= 1;
-    else if (name == ".got")
-      rank |= 2;
     else if (name == ".toc")
-      rank |= 4;
+      rank |= 2;
   }
 
   if (config->emachine == EM_MIPS) {