IR: Make metadata typeless in assembly

Now that `Metadata` is typeless, reflect that in the assembly.  These
are the matching assembly changes for the metadata/value split in
r223802.

  - Only use the `metadata` type when referencing metadata from a call
    intrinsic -- i.e., only when it's used as a `Value`.

  - Stop pretending that `ValueAsMetadata` is wrapped in an `MDNode`
    when referencing it from call intrinsics.

So, assembly like this:

    define @foo(i32 %v) {
      call void @llvm.foo(metadata !{i32 %v}, metadata !0)
      call void @llvm.foo(metadata !{i32 7}, metadata !0)
      call void @llvm.foo(metadata !1, metadata !0)
      call void @llvm.foo(metadata !3, metadata !0)
      call void @llvm.foo(metadata !{metadata !3}, metadata !0)
      ret void, !bar !2
    }
    !0 = metadata !{metadata !2}
    !1 = metadata !{i32* @global}
    !2 = metadata !{metadata !3}
    !3 = metadata !{}

turns into this:

    define @foo(i32 %v) {
      call void @llvm.foo(metadata i32 %v, metadata !0)
      call void @llvm.foo(metadata i32 7, metadata !0)
      call void @llvm.foo(metadata i32* @global, metadata !0)
      call void @llvm.foo(metadata !3, metadata !0)
      call void @llvm.foo(metadata !{!3}, metadata !0)
      ret void, !bar !2
    }
    !0 = !{!2}
    !1 = !{i32* @global}
    !2 = !{!3}
    !3 = !{}

I wrote an upgrade script that handled almost all of the tests in llvm
and many of the tests in cfe (even handling many `CHECK` lines).  I've
attached it (or will attach it in a moment if you're speedy) to PR21532
to help everyone update their out-of-tree testcases.

This is part of PR21532.

llvm-svn: 224257

1 files changed, 7 insertions, 7 deletions

diff --git a/llvm/test/Feature/md_on_instruction.ll b/llvm/test/Feature/md_on_instruction.ll
index fe011620051..2729d063a4d 100644
--- a/llvm/test/Feature/md_on_instruction.ll
+++ b/llvm/test/Feature/md_on_instruction.ll
@@ -18,10 +18,10 @@ declare void @llvm.dbg.region.end(metadata) nounwind readnone
 
 !llvm.module.flags = !{!6}
 
-!0 = metadata !{metadata !"0x2e\00foo\00foo\00foo\001\000\001\000\006\000\000\000", i32 0, metadata !1, metadata !2, null, null, null, null} ; [ DW_TAG_subprogram ]
-!1 = metadata !{metadata !"0x11\0012\00clang 1.0\001\00\000\00\000", metadata !4, metadata !5, metadata !5, metadata !4, null, null} ; [ DW_TAG_compile_unit ]
-!2 = metadata !{metadata !"0x24\00int\000\0032\0032\000\000\005", null, metadata !1} ; [ DW_TAG_base_type ]
-!3 = metadata !{i32 1, i32 13, metadata !1, metadata !1}
-!4 = metadata !{metadata !"foo.c", metadata !"/tmp"}
-!5 = metadata !{i32 0}
-!6 = metadata !{i32 1, metadata !"Debug Info Version", i32 2}
+!0 = !{!"0x2e\00foo\00foo\00foo\001\000\001\000\006\000\000\000", i32 0, !1, !2, null, null, null, null} ; [ DW_TAG_subprogram ]
+!1 = !{!"0x11\0012\00clang 1.0\001\00\000\00\000", !4, !5, !5, !4, null, null} ; [ DW_TAG_compile_unit ]
+!2 = !{!"0x24\00int\000\0032\0032\000\000\005", null, !1} ; [ DW_TAG_base_type ]
+!3 = !{i32 1, i32 13, !1, !1}
+!4 = !{!"foo.c", !"/tmp"}
+!5 = !{i32 0}
+!6 = !{i32 1, !"Debug Info Version", i32 2}