DWARF processor: add DIE context to exceptions

```
$ stg --elf tls.o
dwarf_getlocation returned empty expression
processing DIE 0x23
processing DIE 0xc
```

PiperOrigin-RevId: 590237411
Change-Id: I2d3b1f875ec3bc0d02833ec583e90812294d6f5b

1 files changed, 11 insertions, 0 deletions

diff --git a/dwarf_processor.cc b/dwarf_processor.cc
index 7f91653..48d6e26 100644
--- a/dwarf_processor.cc
+++ b/dwarf_processor.cc
@@ -301,6 +301,17 @@ class Processor {
 
  private:
   void Process(Entry& entry) {
+    try {
+      return ProcessInternal(entry);
+    } catch (Exception& e) {
+      std::ostringstream os;
+      os << "processing DIE " << Hex(entry.GetOffset());
+      e.Add(os.str());
+      throw;
+    }
+  }
+
+  void ProcessInternal(Entry& entry) {
     ++result_.processed_entries;
     auto tag = entry.GetTag();
     switch (tag) {