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
diff --git a/llvm/test/Linker/debug-info-version-b.ll b/llvm/test/Linker/debug-info-version-b.ll
index 2b4f184..515291f 100644
--- a/llvm/test/Linker/debug-info-version-b.ll
+++ b/llvm/test/Linker/debug-info-version-b.ll
@@ -5,6 +5,6 @@
!llvm.dbg.cu = !{!1}
!0 = metadata !{i32 2, metadata !"Debug Info Version", i32 42}
-!1 = metadata !{i32 589841, metadata !2, i32 12, metadata !"clang", metadata !"I AM UNEXPECTED!"} ; [ DW_TAG_compile_unit ]
+!1 = metadata !{metadata !"0x11\0012\00clang\000\00", metadata !"I AM UNEXPECTED!"} ; [ DW_TAG_compile_unit ]
!2 = metadata !{metadata !"b.c", metadata !""}
!3 = metadata !{}