Revert "Revert "DI: Fold constant arguments into a single MDString""

This reverts commit r218918, effectively reapplying r218914 after fixing
an Ocaml bindings test and an Asan crash.  The root cause of the latter
was a tightened-up check in `DILexicalBlock::Verify()`, so I'll file a
PR to investigate who requires the loose check (and why).

Original commit message follows.

--

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: 219010

1 files changed, 9 insertions, 9 deletions

diff --git a/llvm/test/CodeGen/Inputs/DbgValueOtherTargets.ll b/llvm/test/CodeGen/Inputs/DbgValueOtherTargets.ll
index 60b00b5dd84..2d05b45894f 100644
--- a/llvm/test/CodeGen/Inputs/DbgValueOtherTargets.ll
+++ b/llvm/test/CodeGen/Inputs/DbgValueOtherTargets.ll
@@ -3,7 +3,7 @@
 define i32 @main() nounwind ssp {
 entry:
 ; CHECK: DEBUG_VALUE
-  call void @llvm.dbg.value(metadata !6, i64 0, metadata !7, metadata !{i32 786690}), !dbg !9
+  call void @llvm.dbg.value(metadata !6, i64 0, metadata !7, metadata !{metadata !"0x102"}), !dbg !9
   ret i32 0, !dbg !10
 }
 
@@ -14,17 +14,17 @@ declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnon
 !llvm.dbg.cu = !{!2}
 !llvm.module.flags = !{!13}
 
-!0 = metadata !{i32 786478, metadata !12, metadata !1, metadata !"main", metadata !"main", metadata !"", i32 2, metadata !3, i1 false, i1 true, i32 0, i32 0, null, i32 0, i1 false, i32 ()* @main, null, null, null, i32 0} ; [ DW_TAG_subprogram ]
-!1 = metadata !{i32 786473, metadata !12} ; [ DW_TAG_file_type ]
-!2 = metadata !{i32 786449, metadata !12, i32 12, metadata !"clang version 2.9 (trunk 120996)", i1 false, metadata !"", i32 0, metadata !6, metadata !6, metadata !11, null, null, metadata !""} ; [ DW_TAG_compile_unit ]
-!3 = metadata !{i32 786453, metadata !12, metadata !1, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !4, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
+!0 = metadata !{metadata !"0x2e\00main\00main\00\002\000\001\000\006\000\000\000", metadata !12, metadata !1, metadata !3, null, i32 ()* @main, null, null, null} ; [ DW_TAG_subprogram ]
+!1 = metadata !{metadata !"0x29", metadata !12} ; [ DW_TAG_file_type ]
+!2 = metadata !{metadata !"0x11\0012\00clang version 2.9 (trunk 120996)\000\00\000\00\000", metadata !12, metadata !6, metadata !6, metadata !11, null, null} ; [ DW_TAG_compile_unit ]
+!3 = metadata !{metadata !"0x15\00\000\000\000\000\000\000", metadata !12, metadata !1, null, metadata !4, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
 !4 = metadata !{metadata !5}
-!5 = metadata !{i32 786468, metadata !12, metadata !2, metadata !"int", i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ]
+!5 = metadata !{metadata !"0x24\00int\000\0032\0032\000\000\005", metadata !12, metadata !2} ; [ DW_TAG_base_type ]
 !6 = metadata !{i32 0}
-!7 = metadata !{i32 786688, metadata !8, metadata !"i", metadata !1, i32 3, metadata !5, i32 0, null} ; [ DW_TAG_auto_variable ]
-!8 = metadata !{i32 786443, metadata !12, metadata !0, i32 2, i32 12, i32 0} ; [ DW_TAG_lexical_block ]
+!7 = metadata !{metadata !"0x100\00i\003\000", metadata !8, metadata !1, metadata !5} ; [ DW_TAG_auto_variable ]
+!8 = metadata !{metadata !"0xb\002\0012\000", metadata !12, metadata !0} ; [ DW_TAG_lexical_block ]
 !9 = metadata !{i32 3, i32 11, metadata !8, null}
 !10 = metadata !{i32 4, i32 2, metadata !8, null}
 !11 = metadata !{metadata !0}
 !12 = metadata !{metadata !"/tmp/x.c", metadata !"/Users/manav"}
-!13 = metadata !{i32 1, metadata !"Debug Info Version", i32 1}
+!13 = metadata !{i32 1, metadata !"Debug Info Version", i32 2}