Add testoutput/dwarf/cold (#330)

No functionality changes yet.

Author: philipc

testinput

@@ -0,0 +1,111 @@
+0x0000000000001060
+_ZN3Foo3fooEi
+/object/testfiles/dwarf/cold.cpp:29
+0x0000000000001067
+_ZN3Foo3fooEi
+/object/testfiles/dwarf/cold.cpp:29
+0x000000000000106e
+_ZN3Foo3barEPKc
+/object/testfiles/dwarf/cold.cpp:20
+_ZN3Foo3fooEi
+/object/testfiles/dwarf/cold.cpp:29
+0x0000000000001075
+_ZN3Foo3barEPKc
+/object/testfiles/dwarf/cold.cpp:21
+_ZN3Foo3fooEi
+/object/testfiles/dwarf/cold.cpp:29
+0x0000000000001078
+_ZN3Foo3barEPKc
+/object/testfiles/dwarf/cold.cpp:20
+_ZN3Foo3fooEi
+/object/testfiles/dwarf/cold.cpp:29
+0x000000000000107c
+_ZN3Foo3barEPKc
+/object/testfiles/dwarf/cold.cpp:20
+_ZN3Foo3fooEi
+/object/testfiles/dwarf/cold.cpp:29
+0x0000000000001081
+_ZN3Foo3fooEi
+/object/testfiles/dwarf/cold.cpp:30
+0x0000000000001082
+_ZN3Foo3barEPKc
+/object/testfiles/dwarf/cold.cpp:18
+0x0000000000001086
+_ZN3Foo3barEPKc
+/object/testfiles/dwarf/cold.cpp:20
+0x0000000000001094
+_ZN3Foo3barEPKc
+/object/testfiles/dwarf/cold.cpp:21
+0x0000000000001097
+_ZN3Foo3barEPKc
+/object/testfiles/dwarf/cold.cpp:20
+0x000000000000109b
+_ZN3Foo3barEPKc
+/object/testfiles/dwarf/cold.cpp:20
+0x00000000000010a0
+_ZN3Foo3barEPKc
+/object/testfiles/dwarf/cold.cpp:22
+0x00000000000010b0
+main
+/object/testfiles/dwarf/cold.cpp:32
+0x00000000000010ba
+main
+/object/testfiles/dwarf/cold.cpp:36
+0x00000000000010bf
+main
+/object/testfiles/dwarf/cold.cpp:32
+0x00000000000010c3
+main
+/object/testfiles/dwarf/cold.cpp:35
+0x00000000000010e4
+main
+/object/testfiles/dwarf/cold.cpp:36
+0x00000000000010f2
+main
+/object/testfiles/dwarf/cold.cpp:37
+0x00000000000010f8
+main
+/object/testfiles/dwarf/cold.cpp:38
+0x0000000000001102
+main
+/object/testfiles/dwarf/cold.cpp:37
+0x0000000000001107
+main
+/object/testfiles/dwarf/cold.cpp:40
+0x000000000000111f
+main
+/object/testfiles/dwarf/cold.cpp:40
+0x0000000000001122
+main
+/object/testfiles/dwarf/cold.cpp:40
+0x0000000000001130
+_ZN3Foo3fooEi
+/object/testfiles/dwarf/cold.cpp:25
+0x0000000000001134
+_ZN3Foo3fooEi
+/object/testfiles/dwarf/cold.cpp:26
+0x000000000000113c
+_ZN3Foo3barEPKc
+/object/testfiles/dwarf/cold.cpp:20
+_ZN3Foo3fooEi
+/object/testfiles/dwarf/cold.cpp:27
+0x0000000000001160
+_ZN3Foo3barEPKc
+/object/testfiles/dwarf/cold.cpp:21
+_ZN3Foo3fooEi
+/object/testfiles/dwarf/cold.cpp:27
+0x0000000000001163
+_ZN3Foo3barEPKc
+/object/testfiles/dwarf/cold.cpp:21
+_ZN3Foo3fooEi
+/object/testfiles/dwarf/cold.cpp:27
+0x0000000000001167
+_ZN3Foo3barEPKc
+/object/testfiles/dwarf/cold.cpp:21
+_ZN3Foo3fooEi
+/object/testfiles/dwarf/cold.cpp:27
+0x000000000000116b
+_ZN3Foo3barEPKc
+/object/testfiles/dwarf/cold.cpp:20
+_ZN3Foo3fooEi
+/object/testfiles/dwarf/cold.cpp:27

testoutput/dwarf/cold

@@ -67,9 +67,16 @@ fn run_test(in_path: PathBuf, out_path: PathBuf) -> Result<(), Failed> {
     if out_data != expect_out_data {
         let out_str = String::from_utf8_lossy(&out_data);
         let expect_out_str = String::from_utf8_lossy(&expect_out_data);
-        return Err(
-            format!("output mismatch\nexpected:\n{expect_out_str}\nactual:\n{out_str}").into(),
-        );
+        return Err(format!(
+            "\
+            output mismatch\n\
+            expected:\n\
+            {expect_out_str}\n\
+            actual:\n\
+            {out_str}\n\
+            Set ADDR2LINE_TESTOUTPUT_UPDATE=1 to update expected output"
+        )
+        .into());
     }
 
     Ok(())