test: adjust the test for the earlier snapshot

The memory attribute was added later and this branch does not support
it.  It somehow passed the testing in CI, remove it as it was reported
as causing a failure.

Author: compnerd

llvm/test/DebugInfo/codeview-bit-slice-fragments.ll

@@ -25,7 +25,7 @@ entryresume.0:
 
 declare void @llvm.dbg.value(metadata %0, metadata %1, metadata %2) #0
 
-attributes #0 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
+attributes #0 = { nocallback nofree nosync nounwind speculatable willreturn }
 
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!3, !4}