Sink dwarf unit length emission down into DwarfUnit::emitHeader

This allows the CU label to be emitted only for compile units, as
they're the only ones that need it (so they can be referenced from
pubnames)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221072 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/AsmPrinter/DwarfFile.cpp

@@ -55,13 +55,6 @@ void DwarfFile::emitUnits(const MCSymbol *ASectionSym) {
     const MCSection *USection = TheU->getSection();
     Asm->OutStreamer.SwitchSection(USection);
 
-    // Emit the compile units header.
-    Asm->OutStreamer.EmitLabel(TheU->getLabelBegin());
-
-    // Emit size of content not including length itself
-    Asm->OutStreamer.AddComment("Length of Unit");
-    Asm->EmitInt32(TheU->getHeaderSize() + Die.getSize());
-
     TheU->emitHeader(ASectionSym);
 
     DD.emitDIE(Die);