StringRefize some debug accel table bits.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181663 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/AsmPrinter/DwarfAccelTable.cpp b/lib/CodeGen/AsmPrinter/DwarfAccelTable.cpp
index f58ec9b..a82a149 100644
--- a/lib/CodeGen/AsmPrinter/DwarfAccelTable.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfAccelTable.cpp
@@ -76,7 +76,7 @@
   return A->Die->getOffset() < B->Die->getOffset();
 }
 
-void DwarfAccelTable::FinalizeTable(AsmPrinter *Asm, const char *Prefix) {
+void DwarfAccelTable::FinalizeTable(AsmPrinter *Asm, StringRef Prefix) {
   // Create the individual hash data outputs.
   for (StringMap<DataArray>::iterator
          EI = Entries.begin(), EE = Entries.end(); EI != EE; ++EI) {