[MC] Add a test for state reset in MCMachOStreamer

This was fixed in r254751, but untestable until r254774, which
added the necessary command line flag to llc. Add a test now
to make sure this doesn't regress again.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@254814 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/MC/MachO/empty-twice.ll b/test/MC/MachO/empty-twice.ll
new file mode 100644 (file)
index 0000000..6914c73
--- /dev/null
+++ b/test/MC/MachO/empty-twice.ll
@@ -0,0 +1,12 @@
+; Check that there is no persistent state in the MachO emitter that crashes
+; us when reusing the pass manager.
+; RUN: llc -mtriple=x86_64-apple-darwin -compile-twice -filetype=obj %s -o -
+
+; Force the creation of a DWARF section
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!3, !4}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "LLVM", isOptimized: true)
+!1 = !DIFile(filename: "<stdin>", directory: "/")
+!3 = !{i32 2, !"Dwarf Version", i32 4}
+!4 = !{i32 2, !"Debug Info Version", i32 3}