llvm-symbolizer: prefer .dwo contents over fission-gmlt-like-data when .dwo file is present

Rather than relying on the gmlt-like data emitted into the .o/executable
which only contains the simple name of any inlined functions, use the
.dwo file if present.

Test symbolication with/without a .dwo, and the old test that was
testing behavior when no gmlt-like data was present. (I haven't included
a test of non-gmlt-like data + no .dwo (that would be akin to
symbolication with no debug info) but we could add one for completeness)

The test was simplified a bit to be a little clearer (unoptimized, force
inline, using a function call as the inlined entity) and regenerated
with ToT clang. For the no-gmlt-like-data case, I modified Clang back to
its old behavior temporarily & the .dwo file is identical so it is
shared between the two executables.

llvm-svn: 267227

4 files changed, 8 insertions, 5 deletions

diff --git a/llvm/test/DebugInfo/Inputs/split-dwarf-test b/llvm/test/DebugInfo/Inputs/split-dwarf-test
index a4411129a9b..4d6aa0cd98a 100755
--- a/llvm/test/DebugInfo/Inputs/split-dwarf-test
+++ b/llvm/test/DebugInfo/Inputs/split-dwarf-test
diff --git a/llvm/test/DebugInfo/Inputs/split-dwarf-test-nogmlt b/llvm/test/DebugInfo/Inputs/split-dwarf-test-nogmlt
new file mode 100755
index 00000000000..6a340aa47e6
--- /dev/null
+++ b/llvm/test/DebugInfo/Inputs/split-dwarf-test-nogmlt
diff --git a/llvm/test/DebugInfo/Inputs/split-dwarf-test.cc b/llvm/test/DebugInfo/Inputs/split-dwarf-test.cc
index 5ed56f94b36..b41423dd815 100644
--- a/llvm/test/DebugInfo/Inputs/split-dwarf-test.cc
+++ b/llvm/test/DebugInfo/Inputs/split-dwarf-test.cc
@@ -1,13 +1,16 @@
-int foo(int a) {
-  return a + 1;
+void f1() {
 }
 
-int main(int argc, char *argv[]) {
-  return foo(argc);
+inline __attribute__((always_inline)) void f2() {
+  f1();
+}
+
+int main() {
+  f2();
 }
 
 // Build instructions:
-// 1) clang++ -### -O2 -gsplit-dwarf.cc split-dwarf-test.cc -o split-dwarf-test
+// 1) clang++ -### -gsplit-dwarf split-dwarf-test.cc -o split-dwarf-test
 // 2) Replace the value "-fdebug-compilation-dir" flag to "Output"
 //      (this is the temp directory used by lit).
 // 3) Manually run clang-cc1, objcopy and ld invocations.
diff --git a/llvm/test/DebugInfo/Inputs/split-dwarf-test.dwo b/llvm/test/DebugInfo/Inputs/split-dwarf-test.dwo
index 74183a4b622..588374d7d21 100644
--- a/llvm/test/DebugInfo/Inputs/split-dwarf-test.dwo
+++ b/llvm/test/DebugInfo/Inputs/split-dwarf-test.dwo