DebugInfo: Avoid creating unnecessary/empty line tables and remove the special case of '0' in DwarfCompileUnit::initStmtList by just always using a label difference

This moves one case of raw text checking down into the MCStreamer
interfaces in the form of a virtual function, even if we ultimately end
up consolidating on the one-or-many line tables issue one day, this is
nicer in the interim. This just generally streamlines a bunch of use
cases into a common code path.

llvm-svn: 205287

1 files changed, 2 insertions, 4 deletions

diff --git a/llvm/lib/MC/MCDwarf.cpp b/llvm/lib/MC/MCDwarf.cpp
index 231948eaff5..72836ff32ec 100644
--- a/llvm/lib/MC/MCDwarf.cpp
+++ b/llvm/lib/MC/MCDwarf.cpp
@@ -788,10 +788,8 @@ void MCGenDwarfInfo::Emit(MCStreamer *MCOS) {
   bool CreateDwarfSectionSymbols =
       AsmInfo->doesDwarfUseRelocationsAcrossSections();
   MCSymbol *LineSectionSymbol = nullptr;
-  if (CreateDwarfSectionSymbols) {
-    LineSectionSymbol = context.CreateTempSymbol();
-    context.setMCLineTableSymbol(LineSectionSymbol, 0);
-  }
+  if (CreateDwarfSectionSymbols)
+    LineSectionSymbol = MCOS->getDwarfLineTableSymbol(0);
   MCSymbol *AbbrevSectionSymbol = NULL;
   MCSymbol *InfoSectionSymbol = NULL;
   MCOS->SwitchSection(context.getObjectFileInfo()->getDwarfInfoSection());