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, 5 insertions, 5 deletions

diff --git a/llvm/test/Linker/debug-info-version-a.ll b/llvm/test/Linker/debug-info-version-a.ll
index 64a058381f9..352fcdcb77c 100644
--- a/llvm/test/Linker/debug-info-version-a.ll
+++ b/llvm/test/Linker/debug-info-version-a.ll
@@ -4,13 +4,13 @@
 ; from the other file should be dropped.
 
 ; CHECK-NOT: metadata !{metadata !"b.c", metadata !""}
-; CHECK: metadata !{metadata !"a.c", metadata !""}
+; CHECK:  !"a.c", !""}
 ; CHECK-NOT: metadata !{metadata !"b.c", metadata !""}
 
 !llvm.module.flags = !{ !0 }
 !llvm.dbg.cu = !{!1}
 
-!0 = metadata !{i32 2, metadata !"Debug Info Version", i32 2}
-!1 = metadata !{metadata !"0x11\0012\00clang\001\00\000\00\000", metadata !2, metadata !3, metadata !3, metadata !3, null, null} ; [ DW_TAG_compile_unit ]
-!2 = metadata !{metadata !"a.c", metadata !""}
-!3 = metadata !{}
+!0 = !{i32 2, !"Debug Info Version", i32 2}
+!1 = !{!"0x11\0012\00clang\001\00\000\00\000", !2, !3, !3, !3, null, null} ; [ DW_TAG_compile_unit ]
+!2 = !{!"a.c", !""}
+!3 = !{}