DwarfAccelTable: We know how many hashes we have in the output, just reserve the precise number

llvm-svn: 230865

llvm/lib/CodeGen/AsmPrinter/DwarfAccelTable.cpp

@@ -70,6 +70,7 @@ static bool compareDIEs(const DwarfAccelTable::HashDataContents *A,
 
 void DwarfAccelTable::FinalizeTable(AsmPrinter *Asm, StringRef Prefix) {
   // Create the individual hash data outputs.
+  Data.reserve(Entries.size());
   for (StringMap<DataArray>::iterator EI = Entries.begin(), EE = Entries.end();
        EI != EE; ++EI) {