[DWARF] Fix dwarf5-index-is-used.cpp

Summary:
`dwarf5-index-is-used.cpp` have been failing after rL340206, because `clang`
have stopped to emit pubnames by default after that change. Current patch adds
`-gpubnames` option to the `clang` command line in the test to emit pubnames.

Reviewers: labath, dblaikie

Reviewed By: labath

Subscribers: clayborg, probinson, teemperor, lldb-commits, aprantl, JDevlieghere, abidh, stella.stamenova

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D51208

llvm-svn: 341296

lldb/lit/SymbolFile/DWARF/dwarf5-index-is-used.cpp

@@ -2,7 +2,7 @@
 
 // REQUIRES: lld
 
-// RUN: clang %s -g -c -o %t.o --target=x86_64-pc-linux -mllvm -accel-tables=Dwarf
+// RUN: clang %s -g -c -o %t.o --target=x86_64-pc-linux -mllvm -accel-tables=Dwarf -gpubnames
 // RUN: ld.lld %t.o -o %t
 // RUN: lldb-test symbols %t | FileCheck %s