DI: Fold constant arguments into a single MDString

This patch addresses the first stage of PR17891 by folding constant
arguments together into a single MDString.  Integers are stringified and
a `\0` character is used as a separator.

Part of PR17891.

Note: I've attached my testcases upgrade scripts to the PR.  If I've
just broken your out-of-tree testcases, they might help.

llvm-svn: 218914

1 files changed, 8 insertions, 8 deletions

diff --git a/llvm/test/CodeGen/XCore/dwarf_debug.ll b/llvm/test/CodeGen/XCore/dwarf_debug.ll
index 8c4678adca9..47db82d0904 100644
--- a/llvm/test/CodeGen/XCore/dwarf_debug.ll
+++ b/llvm/test/CodeGen/XCore/dwarf_debug.ll
@@ -13,7 +13,7 @@ define i32 @f(i32 %a) {
 entry:
   %a.addr = alloca i32, align 4
   store i32 %a, i32* %a.addr, align 4
-  call void @llvm.dbg.declare(metadata !{i32* %a.addr}, metadata !11, metadata !{i32 786690}), !dbg !12
+  call void @llvm.dbg.declare(metadata !{i32* %a.addr}, metadata !11, metadata !{metadata !"0x102"}), !dbg !12
   %0 = load i32* %a.addr, align 4, !dbg !12
   %add = add nsw i32 %0, 1, !dbg !12
   ret i32 %add, !dbg !12
@@ -23,17 +23,17 @@ declare void @llvm.dbg.declare(metadata, metadata, metadata)
 
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!9, !10}
-!0 = metadata !{i32 786449, metadata !1, i32 12, metadata !"", i1 false, metadata !"", i32 0, metadata !2, metadata !2, metadata !3, metadata !2, metadata !2, metadata !"", i32 1}
+!0 = metadata !{metadata !"0x11\0012\00\000\00\000\00\001", metadata !1, metadata !2, metadata !2, metadata !3, metadata !2, metadata !2} ; [ DW_TAG_compile_unit ]
 !1 = metadata !{metadata !"", metadata !""}
 !2 = metadata !{}
 !3 = metadata !{metadata !4}
-!4 = metadata !{i32 786478, metadata !1, metadata !5, metadata !"f", metadata !"f", metadata !"", i32 2, metadata !6, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 false, i32 (i32)* @f, null, null, metadata !2, i32 2}
-!5 = metadata !{i32 786473, metadata !1}
-!6 = metadata !{i32 786453, i32 0, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !7, i32 0, null, null, null}
+!4 = metadata !{metadata !"0x2e\00f\00f\00\002\000\001\000\006\00256\000\002", metadata !1, metadata !5, metadata !6, null, i32 (i32)* @f, null, null, metadata !2} ; [ DW_TAG_subprogram ]
+!5 = metadata !{metadata !"0x29", metadata !1} ; [ DW_TAG_file_type ]
+!6 = metadata !{metadata !"0x15\00\000\000\000\000\000\000", i32 0, null, null, metadata !7, null, null, null} ; [ DW_TAG_subroutine_type ]
 !7 = metadata !{metadata !8, metadata !8}
-!8 = metadata !{i32 786468, null, null, metadata !"int", i32 0, i64 32, i64 32, i64 0, i32 0, i32 5}
+!8 = metadata !{metadata !"0x24\00int\000\0032\0032\000\000\005", null, null} ; [ DW_TAG_base_type ]
 !9 = metadata !{i32 2, metadata !"Dwarf Version", i32 4}
-!10 = metadata !{i32 2, metadata !"Debug Info Version", i32 1}
-!11 = metadata !{i32 786689, metadata !4, metadata !"a", metadata !5, i32 16777218, metadata !8, i32 0, i32 0}
+!10 = metadata !{i32 2, metadata !"Debug Info Version", i32 2}
+!11 = metadata !{metadata !"0x101\00a\0016777218\000", metadata !4, metadata !5, metadata !8} ; [ DW_TAG_arg_variable ]
 !12 = metadata !{i32 2, i32 0, metadata !4, null}