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, 9 insertions, 9 deletions

diff --git a/llvm/test/DebugInfo/X86/formal_parameter.ll b/llvm/test/DebugInfo/X86/formal_parameter.ll
index b204017e72f..56891ec61a0 100644
--- a/llvm/test/DebugInfo/X86/formal_parameter.ll
+++ b/llvm/test/DebugInfo/X86/formal_parameter.ll
@@ -28,7 +28,7 @@ define void @foo(i32 %map) #0 {
 entry:
   %map.addr = alloca i32, align 4
   store i32 %map, i32* %map.addr, align 4, !tbaa !15
-  call void @llvm.dbg.declare(metadata !{i32* %map.addr}, metadata !10, metadata !{i32 786690}), !dbg !14
+  call void @llvm.dbg.declare(metadata !{i32* %map.addr}, metadata !10, metadata !{metadata !"0x102"}), !dbg !14
   %call = call i32 (i32*, ...)* bitcast (i32 (...)* @lookup to i32 (i32*, ...)*)(i32* %map.addr) #3, !dbg !19
   ; Ensure that all dbg intrinsics have the same scope after
   ; LowerDbgDeclare is finished with them.
@@ -59,19 +59,19 @@ attributes #3 = { nounwind }
 !llvm.module.flags = !{!11, !12}
 !llvm.ident = !{!13}
 
-!0 = metadata !{i32 786449, metadata !1, i32 12, metadata !"clang version 3.5.0 ", i1 true, metadata !"", i32 0, metadata !2, metadata !2, metadata !3, metadata !2, metadata !2, metadata !"", i32 1} ; [ DW_TAG_compile_unit ] [formal_parameter.c] [DW_LANG_C99]
+!0 = metadata !{metadata !"0x11\0012\00clang version 3.5.0 \001\00\000\00\001", metadata !1, metadata !2, metadata !2, metadata !3, metadata !2, metadata !2} ; [ DW_TAG_compile_unit ] [formal_parameter.c] [DW_LANG_C99]
 !1 = metadata !{metadata !"formal_parameter.c", metadata !""}
 !2 = metadata !{}
 !3 = metadata !{metadata !4}
-!4 = metadata !{i32 786478, metadata !1, metadata !5, metadata !"foo", metadata !"foo", metadata !"", i32 1, metadata !6, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 true, void (i32)* @foo, null, null, metadata !9, i32 2} ; [ DW_TAG_subprogram ] [line 1] [def] [scope 2] [foo]
-!5 = metadata !{i32 786473, metadata !1}          ; [ DW_TAG_file_type ] [formal_parameter.c]
-!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} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
+!4 = metadata !{metadata !"0x2e\00foo\00foo\00\001\000\001\000\006\00256\001\002", metadata !1, metadata !5, metadata !6, null, void (i32)* @foo, null, null, metadata !9} ; [ DW_TAG_subprogram ] [line 1] [def] [scope 2] [foo]
+!5 = metadata !{metadata !"0x29", metadata !1}          ; [ DW_TAG_file_type ] [formal_parameter.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 !{null, metadata !8}
-!8 = metadata !{i32 786468, null, null, metadata !"int", i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ] [int] [line 0, size 32, align 32, offset 0, enc DW_ATE_signed]
+!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 !{metadata !10}
-!10 = metadata !{i32 786689, metadata !4, metadata !"map", metadata !5, i32 16777217, metadata !8, i32 0, i32 0} ; [ DW_TAG_arg_variable ] [map] [line 1]
+!10 = metadata !{metadata !"0x101\00map\0016777217\000", metadata !4, metadata !5, metadata !8} ; [ DW_TAG_arg_variable ] [map] [line 1]
 !11 = metadata !{i32 2, metadata !"Dwarf Version", i32 2}
-!12 = metadata !{i32 1, metadata !"Debug Info Version", i32 1}
+!12 = metadata !{i32 1, metadata !"Debug Info Version", i32 2}
 !13 = metadata !{metadata !"clang version 3.5.0 "}
 !14 = metadata !{i32 1, i32 0, metadata !4, null}
 !15 = metadata !{metadata !16, metadata !16, i64 0}
@@ -80,5 +80,5 @@ attributes #3 = { nounwind }
 !18 = metadata !{metadata !"Simple C/C++ TBAA"}
 !19 = metadata !{i32 3, i32 0, metadata !4, null}
 !20 = metadata !{i32 4, i32 0, metadata !21, null}
-!21 = metadata !{i32 786443, metadata !1, metadata !4, i32 4, i32 0, i32 0, i32 0} ; [ DW_TAG_lexical_block ] [formal_parameter.c]
+!21 = metadata !{metadata !"0xb\004\000\000", metadata !1, metadata !4} ; [ DW_TAG_lexical_block ] [formal_parameter.c]
 !22 = metadata !{i32 5, i32 0, metadata !4, null}