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, 6 insertions, 6 deletions

diff --git a/llvm/test/DebugInfo/ARM/selectiondag-deadcode.ll b/llvm/test/DebugInfo/ARM/selectiondag-deadcode.ll
index c73ee84b86b..76e19efc49a 100644
--- a/llvm/test/DebugInfo/ARM/selectiondag-deadcode.ll
+++ b/llvm/test/DebugInfo/ARM/selectiondag-deadcode.ll
@@ -13,15 +13,15 @@ _ZN7Vector39NormalizeEv.exit:                     ; preds = %1, %0
   ; and SelectionDAGISel crashes.  It should definitely not
   ; crash. Drop the dbg_value instead.
   ; CHECK-NOT: "matrix"
-  tail call void @llvm.dbg.declare(metadata !{%class.Matrix3.0.6.10* %agg.result}, metadata !45, metadata !{i32 786690})
+  tail call void @llvm.dbg.declare(metadata !{%class.Matrix3.0.6.10* %agg.result}, metadata !45, metadata !{metadata !"0x102"})
   %2 = getelementptr inbounds %class.Matrix3.0.6.10* %agg.result, i32 0, i32 0, i32 8
   ret void
 }
 declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
 declare arm_aapcscc void @_ZL4Sqrtd() #2
-!4 = metadata !{i32 786434, metadata !5, null, metadata !"Matrix3", i32 20, i64 288, i64 32, i32 0, i32 0, null, null, i32 0, null, null, metadata !"_ZTS7Matrix3"} ; [ DW_TAG_class_type ] [Matrix3] [line 20, size 288, align 32, offset 0] [def] [from ]
+!4 = metadata !{metadata !"0x2\00Matrix3\0020\00288\0032\000\000\000", metadata !5, null, null, null, null, null, metadata !"_ZTS7Matrix3"} ; [ DW_TAG_class_type ] [Matrix3] [line 20, size 288, align 32, offset 0] [def] [from ]
 !5 = metadata !{metadata !"test.ii", metadata !"/Volumes/Data/radar/15094721"}
-!39 = metadata !{i32 786478, metadata !5, metadata !40, metadata !"GetMatrix", metadata !"GetMatrix", metadata !"_Z9GetMatrixv", i32 32, metadata !41, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 true, void (%class.Matrix3.0.6.10*)* @_Z9GetMatrixv, null, null, null, i32 32} ; [ DW_TAG_subprogram ] [line 32] [def] [GetMatrix]
-!40 = metadata !{i32 786473, metadata !5}         ; [ DW_TAG_file_type ] [/Volumes/Data/radar/15094721/test.ii]
-!41 = metadata !{i32 786453, i32 0, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, null, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
-!45 = metadata !{i32 786688, metadata !39, metadata !"matrix", metadata !40, i32 35, metadata !4, i32 8192, i32 0} ; [ DW_TAG_auto_variable ] [matrix] [line 35]
+!39 = metadata !{metadata !"0x2e\00GetMatrix\00GetMatrix\00_Z9GetMatrixv\0032\000\001\000\006\00256\001\0032", metadata !5, metadata !40, metadata !41, null, void (%class.Matrix3.0.6.10*)* @_Z9GetMatrixv, null, null, null} ; [ DW_TAG_subprogram ] [line 32] [def] [GetMatrix]
+!40 = metadata !{metadata !"0x29", metadata !5}         ; [ DW_TAG_file_type ] [/Volumes/Data/radar/15094721/test.ii]
+!41 = metadata !{metadata !"0x15\00\000\000\000\000\000\000", i32 0, null, null, null, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
+!45 = metadata !{metadata !"0x100\00matrix\0035\008192", metadata !39, metadata !40, metadata !4} ; [ DW_TAG_auto_variable ] [matrix] [line 35]