Ignore missing CUs in DWARF rewriting (#3700)

A recent change in LLVM causes it to sometimes end up with a thing
with no parent. That is, a debug_line or a debug_loc that has no CU that
refers to it. This is perhaps LLVM DCEing CUs, or something else that
changed - not sure. But it seems like valid DWARF we should handle.

This PR handles that in our code. Two things broke here. First, locs must
be simply ignored when there is no CU. Second, lines are trickier as we
used to compute their position by scanning them, and that list contained
only ones with a CU. So we missed some and ended up with wrong offsets.
To make things simpler and more robust, just track the position of each
line table on itself.

Fixes #3697

1 files changed, 1 insertions, 0 deletions

diff --git a/third_party/llvm-project/include/llvm/ObjectYAML/DWARFYAML.h b/third_party/llvm-project/include/llvm/ObjectYAML/DWARFYAML.h
index 510610123..bb66565a5 100644
--- a/third_party/llvm-project/include/llvm/ObjectYAML/DWARFYAML.h
+++ b/third_party/llvm-project/include/llvm/ObjectYAML/DWARFYAML.h
@@ -151,6 +151,7 @@ struct LineTableOpcode {
 };
 
 struct LineTable {
+  uint64_t Position; // XXX BINARYEN: the binary location in .debug_line
   InitialLength Length;
   uint16_t Version;
   uint64_t PrologueLength;