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
diff --git a/llvm/test/DebugInfo/Sparc/gnu-window-save.ll b/llvm/test/DebugInfo/Sparc/gnu-window-save.ll
index 66066dd..9c18213 100644
--- a/llvm/test/DebugInfo/Sparc/gnu-window-save.ll
+++ b/llvm/test/DebugInfo/Sparc/gnu-window-save.ll
@@ -55,17 +55,17 @@
 !llvm.module.flags = !{!9, !10}
 !llvm.ident = !{!11}
 
-!0 = metadata !{metadata !"0x11\0012\00clang version 3.5 (http://llvm.org/git/clang.git 6a0714fee07fb7c4e32d3972b4fe2ce2f5678cf4) (llvm/ 672e88e934757f76d5c5e5258be41e7615094844)\000\00\000\00\000", metadata !1, metadata !2, metadata !2, metadata !3, metadata !2, metadata !2} ; [ DW_TAG_compile_unit ] [/home/venkatra/work/benchmarks/test/hello/hello.c] [DW_LANG_C99]
-!1 = metadata !{metadata !"hello.c", metadata !"/home/venkatra/work/benchmarks/test/hello"}
-!2 = metadata !{}
-!3 = metadata !{metadata !4}
-!4 = metadata !{metadata !"0x2e\00main\00main\00\003\000\001\000\006\00256\000\004", metadata !1, metadata !5, metadata !6, null, i32 ()* @main, null, null, metadata !2} ; [ DW_TAG_subprogram ] [line 3] [def] [scope 4] [main]
-!5 = metadata !{metadata !"0x29", metadata !1}          ; [ DW_TAG_file_type ] [/home/venkatra/work/benchmarks/test/hello/hello.c]
-!6 = metadata !{metadata !"0x15\00\000\000\000\000\000\000", i32 0, null, null, metadata !7, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
-!7 = metadata !{metadata !8}
-!8 = metadata !{metadata !"0x24\00int\000\0032\0032\000\000\005", null, null} ; [ DW_TAG_base_type ] [int] [line 0, size 32, align 32, offset 0, enc DW_ATE_signed]
-!9 = metadata !{i32 2, metadata !"Dwarf Version", i32 4}
-!10 = metadata !{i32 1, metadata !"Debug Info Version", i32 2}
-!11 = metadata !{metadata !"clang version 3.5 (http://llvm.org/git/clang.git 6a0714fee07fb7c4e32d3972b4fe2ce2f5678cf4) (llvm/ 672e88e934757f76d5c5e5258be41e7615094844)"}
-!12 = metadata !{i32 5, i32 0, metadata !4, null}
-!13 = metadata !{i32 6, i32 0, metadata !4, null}
+!0 = !{!"0x11\0012\00clang version 3.5 (http://llvm.org/git/clang.git 6a0714fee07fb7c4e32d3972b4fe2ce2f5678cf4) (llvm/ 672e88e934757f76d5c5e5258be41e7615094844)\000\00\000\00\000", !1, !2, !2, !3, !2, !2} ; [ DW_TAG_compile_unit ] [/home/venkatra/work/benchmarks/test/hello/hello.c] [DW_LANG_C99]
+!1 = !{!"hello.c", !"/home/venkatra/work/benchmarks/test/hello"}
+!2 = !{}
+!3 = !{!4}
+!4 = !{!"0x2e\00main\00main\00\003\000\001\000\006\00256\000\004", !1, !5, !6, null, i32 ()* @main, null, null, !2} ; [ DW_TAG_subprogram ] [line 3] [def] [scope 4] [main]
+!5 = !{!"0x29", !1}          ; [ DW_TAG_file_type ] [/home/venkatra/work/benchmarks/test/hello/hello.c]
+!6 = !{!"0x15\00\000\000\000\000\000\000", i32 0, null, null, !7, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
+!7 = !{!8}
+!8 = !{!"0x24\00int\000\0032\0032\000\000\005", null, null} ; [ DW_TAG_base_type ] [int] [line 0, size 32, align 32, offset 0, enc DW_ATE_signed]
+!9 = !{i32 2, !"Dwarf Version", i32 4}
+!10 = !{i32 1, !"Debug Info Version", i32 2}
+!11 = !{!"clang version 3.5 (http://llvm.org/git/clang.git 6a0714fee07fb7c4e32d3972b4fe2ce2f5678cf4) (llvm/ 672e88e934757f76d5c5e5258be41e7615094844)"}
+!12 = !{i32 5, i32 0, !4, null}
+!13 = !{i32 6, i32 0, !4, null}
diff --git a/llvm/test/DebugInfo/Sparc/processes-relocations.ll b/llvm/test/DebugInfo/Sparc/processes-relocations.ll
index 89cab9e..de44cc9 100644
--- a/llvm/test/DebugInfo/Sparc/processes-relocations.ll
+++ b/llvm/test/DebugInfo/Sparc/processes-relocations.ll
@@ -9,9 +9,9 @@
 !llvm.module.flags = !{!3, !4}
 !llvm.ident = !{!5}
 
-!0 = metadata !{i32 786449, metadata !1, i32 12, metadata !"clang version 3.6.0 ", i1 false, metadata !"", i32 0, metadata !2, metadata !2, metadata !2, metadata !2, metadata !2, metadata !"", i32 1} ; [ DW_TAG_compile_unit ] [/a/empty.c] [DW_LANG_C99]
-!1 = metadata !{metadata !"empty.c", metadata !"/a"}
-!2 = metadata !{}
-!3 = metadata !{i32 2, metadata !"Dwarf Version", i32 4}
-!4 = metadata !{i32 2, metadata !"Debug Info Version", i32 1}
-!5 = metadata !{metadata !"clang version 3.6.0 "}
+!0 = !{i32 786449, !1, i32 12, !"clang version 3.6.0 ", i1 false, !"", i32 0, !2, !2, !2, !2, !2, !"", i32 1} ; [ DW_TAG_compile_unit ] [/a/empty.c] [DW_LANG_C99]
+!1 = !{!"empty.c", !"/a"}
+!2 = !{}
+!3 = !{i32 2, !"Dwarf Version", i32 4}
+!4 = !{i32 2, !"Debug Info Version", i32 1}
+!5 = !{!"clang version 3.6.0 "}