[BOLT][DWARF] Fix for .debug_line with DWARF5

There was a bug in a code that pre-populated line string for a case where parts
of .debug_line are not processed by BOLT, but copied as raw data. We were not
switching sections. This resulted in parts of the binary being over-written with
debug data.

Reviewed By: maksfb

Differential Revision: https://reviews.llvm.org/D154544

1 files changed, 5 insertions, 1 deletions

diff --git a/llvm/lib/MC/MCDwarf.cpp b/llvm/lib/MC/MCDwarf.cpp
index 177f957..55632f2 100644
--- a/llvm/lib/MC/MCDwarf.cpp
+++ b/llvm/lib/MC/MCDwarf.cpp
@@ -350,10 +350,14 @@ SmallString<0> MCDwarfLineStr::getFinalizedData() {
   return Data;
 }
 
+size_t MCDwarfLineStr::addString(StringRef Path) {
+  return LineStrings.add(Path);
+}
+
 void MCDwarfLineStr::emitRef(MCStreamer *MCOS, StringRef Path) {
   int RefSize =
       dwarf::getDwarfOffsetByteSize(MCOS->getContext().getDwarfFormat());
-  size_t Offset = LineStrings.add(Path);
+  size_t Offset = addString(Path);
   if (UseRelocs) {
     MCContext &Ctx = MCOS->getContext();
     MCOS->emitValue(makeStartPlusIntExpr(Ctx, *LineStrLabel, Offset), RefSize);