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, 10 insertions, 10 deletions

diff --git a/llvm/test/Transforms/GlobalOpt/2009-03-05-dbg.ll b/llvm/test/Transforms/GlobalOpt/2009-03-05-dbg.ll
index e491297f7a2..05138299169 100644
--- a/llvm/test/Transforms/GlobalOpt/2009-03-05-dbg.ll
+++ b/llvm/test/Transforms/GlobalOpt/2009-03-05-dbg.ll
@@ -55,23 +55,23 @@ declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnon
 
 !llvm.dbg.gv = !{!0}
 
-!0 = metadata !{i32 458804, i32 0, metadata !1, metadata !"Stop", metadata !"Stop", metadata !"", metadata !1, i32 2, metadata !2, i1 true, i1 true, i32* @Stop} ; [ DW_TAG_variable ]
-!1 = metadata !{i32 458769, metadata !20, i32 1, metadata !"4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", i1 true, metadata !"", i32 0, metadata !21, metadata !21, null, null, null, metadata !""} ; [ DW_TAG_compile_unit ]
-!2 = metadata !{i32 458788, null, metadata !1, metadata !"int", i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ]
-!3 = metadata !{i32 459009, metadata !4, metadata !"i", metadata !1, i32 4, metadata !2} ; [ DW_TAG_arg_variable ]
-!4 = metadata !{i32 458798, i32 0, metadata !1, metadata !"foo", metadata !"foo", metadata !"foo", i32 4, metadata !5, i1 false, i1 true, i32 0, i32 0, null, i32 0, i32 0, null, null, null, null, i32 0} ; [ DW_TAG_subprogram ]
-!5 = metadata !{i32 458773, metadata !1, null, metadata !1, i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !6, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
+!0 = metadata !{metadata !"0x34\00Stop\00Stop\00\002\001\001", metadata !1, metadata !1, metadata !2, i32* @Stop} ; [ DW_TAG_variable ]
+!1 = metadata !{metadata !"0x11\001\004.2.1 (Based on Apple Inc. build 5658) (LLVM build)\001\00\000\00\000", metadata !20, metadata !21, metadata !21, null, null, null} ; [ DW_TAG_compile_unit ]
+!2 = metadata !{metadata !"0x24\00int\000\0032\0032\000\000\005", null, metadata !1} ; [ DW_TAG_base_type ]
+!3 = metadata !{metadata !"0x101\00i\004\000", metadata !4, metadata !1, metadata !2} ; [ DW_TAG_arg_variable ]
+!4 = metadata !{metadata !"0x2e\00foo\00foo\00foo\004\000\001\000\006\000\000\000", i32 0, metadata !1, metadata !5, null, null, null, null, null} ; [ DW_TAG_subprogram ]
+!5 = metadata !{metadata !"0x15\00\000\000\000\000\000\000", metadata !1, null, null, metadata !6, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
 !6 = metadata !{metadata !2, metadata !2}
 !7 = metadata !{i32 5, i32 0, metadata !8, null}
-!8 = metadata !{i32 458763, metadata !20, metadata !4, i32 0, i32 0, i32 0} ; [ DW_TAG_lexical_block ]
+!8 = metadata !{metadata !"0xb\000\000\000", metadata !20, metadata !4} ; [ DW_TAG_lexical_block ]
 !9 = metadata !{i32 6, i32 0, metadata !8, null}
 !10 = metadata !{i32 7, i32 0, metadata !8, null}
 !11 = metadata !{i32 9, i32 0, metadata !8, null}
 !12 = metadata !{i32 11, i32 0, metadata !8, null}
 !13 = metadata !{i32 14, i32 0, metadata !14, null}
-!14 = metadata !{i32 458763, metadata !20, metadata !15, i32 0, i32 0, i32 0} ; [ DW_TAG_lexical_block ]
-!15 = metadata !{i32 458798, i32 0, metadata !1, metadata !"bar", metadata !"bar", metadata !"bar", i32 13, metadata !16, i1 false, i1 true, i32 0, i32 0, null, i32 0, i32 0, null, null, null, null, i32 0} ; [ DW_TAG_subprogram ]
-!16 = metadata !{i32 458773, metadata !1, null, metadata !1, i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !17, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
+!14 = metadata !{metadata !"0xb\000\000\000", metadata !20, metadata !15} ; [ DW_TAG_lexical_block ]
+!15 = metadata !{metadata !"0x2e\00bar\00bar\00bar\0013\000\001\000\006\000\000\000", i32 0, metadata !1, metadata !16, null, null, null, null, null} ; [ DW_TAG_subprogram ]
+!16 = metadata !{metadata !"0x15\00\000\000\000\000\000\000", metadata !1, null, null, metadata !17, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
 !17 = metadata !{metadata !2}
 !18 = metadata !{i32 15, i32 0, metadata !14, null}
 !19 = metadata !{i32 16, i32 0, metadata !14, null}