Remove DwarfUnit::LabelRange since it's unused.

Seems at some point the intent was to emit fission ranges_base as unique
per CU but the code today emits ranges_base as the start of the ranges
section for all CUs being compiled and all the ranges_base relative
addresses are relative to that. So removing this dead code and leaving
the status quo until there's a reason to change it (perhaps something's
faster if it has distinct ranges for each CU).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207464 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/AsmPrinter/DwarfUnit.cpp

@@ -2092,5 +2092,4 @@ void DwarfTypeUnit::initSection(const MCSection *Section) {
       Asm->GetTempSymbol(Section->getLabelBeginName(), getUniqueID());
   this->LabelEnd =
       Asm->GetTempSymbol(Section->getLabelEndName(), getUniqueID());
-  this->LabelRange = Asm->GetTempSymbol("gnu_ranges", getUniqueID());
 }