Bug#877727: test_rlib regression with llvm 5.0.0

[Levente Polyak]

Package: diffoscope

test_item1_elf and test_item3_deflate_llvm_bitcode are failing sine llvm
5.0.0.

> llvm-config --version
5.0.0

====================================================================
test session starts
====================================================================
platform linux -- Python 3.6.2, pytest-3.2.2, py-1.4.34, pluggy-0.4.0
rootdir: /home/anthraxx/Projects/external/diffoscope, inifile:
plugins: cov-2.5.1
collected 8 items



tests/comparators/test_rlib.py ....F.F.

=========================================================================
FAILURES
==========================================================================
______________________________________________________________________
test_item1_elf
_______________________________________________________________________

differences = [<Difference nm -s {} -- nm -s {} []>, <Difference
alloc_system-d16b8f0e.0.o -- alloc_system-d16b8f0e.0.o []>, <Differ...r
-dump {} []>, <Difference find {} -execdir llvm-dis -o - '{}' ';' --
find {} -execdir llvm-dis -o - '{}' ';' []>]>]>]

    @skip_unless_tools_exist('nm')
    @skip_if_binutils_does_not_support_x86()
    def test_item1_elf(differences):
        assert differences[1].source1 == 'alloc_system-d16b8f0e.0.o'
        assert differences[1].source2 == 'alloc_system-d16b8f0e.0.o'
        expected_diff = get_data('rlib_elf_expected_diff')
>       assert differences[1].details[0].unified_diff == expected_diff
E       IndexError: list index out of range

tests/comparators/test_rlib.py:75: IndexError
______________________________________________________________
test_item3_deflate_llvm_bitcode
______________________________________________________________

differences = [<Difference nm -s {} -- nm -s {} []>, <Difference
alloc_system-d16b8f0e.0.o -- alloc_system-d16b8f0e.0.o []>, <Differ...r
-dump {} []>, <Difference find {} -execdir llvm-dis -o - '{}' ';' --
find {} -execdir llvm-dis -o - '{}' ';' []>]>]>]

    @skip_unless_tools_exist('llvm-dis')
    @skip_unless_tool_is_at_least('llvm-config', llvm_version, '3.8')
    def test_item3_deflate_llvm_bitcode(differences):
        assert differences[3].source1 ==
'alloc_system-d16b8f0e.0.bytecode.deflate'
        assert differences[3].source2 ==
'alloc_system-d16b8f0e.0.bytecode.deflate'
        expected_diff = get_data('rlib_llvm_dis_expected_diff')
        actual_diff = differences[3].details[0].details[1].unified_diff
>       assert diff_ignore_line_numbers(actual_diff) ==
diff_ignore_line_numbers(expected_diff)
E       AssertionError: assert '@@ -XX,XX +X...ntry-block:\n' == '@@
-XX,XX +XX...ntry-block:\n'
E         Skipping 314 identical leading characters in diff, use -v to show
E         -  i64 %2) #2
E         ?           ^
E         +  i64 %2) #3
E         ?           ^
E           -  br label
%_ZN12alloc_system3imp10reallocate17h4a0811c9ec086854E.exit
E           +  br label
%_ZN12alloc_system3imp10reallocate1l44a0811c9ec086854E.exit...
E
E         ...Full output truncated (42 lines hidden), use '-vv' to show

tests/comparators/test_rlib.py:91: AssertionError
============================================================ 2 failed, 6
passed in 1.74 seconds
=============================================================