[llvm] [llvm-objdump][ELF]Fix crash when reading strings from .dynstr(#86612) (PR #125679)

[James Henderson via llvm-commits]

================
@@ -470,3 +470,47 @@ Sections:
        Value: 0x1
      - Tag:   DT_NULL
        Value: 0x0
+
+# RUN: yaml2obj --docnum=5 %s -o %t5
+# RUN: llvm-objdump -p %t5 2>&1 | FileCheck %s --strict-whitespace -DFILE=%t5 --check-prefix=WARN
+
+# WARN: Program Header:
+# WARN:     LOAD off    0x00000000000000b0 vaddr 0x0000000000001000 paddr 0x0000000000001000 align 2**0
+# WARN:          filesz 0x0000000000000040 memsz 0x0000000000000040 flags ---
+# WARN:  DYNAMIC off    0x00000000000000c0 vaddr 0x000000000000101d paddr 0x000000000000101d align 2**0
+# WARN:          filesz 0x0000000000000030 memsz 0x0000000000000030 flags ---
+# WARN: Dynamic Section:
+# WARN: : warning: '[[FILE]]': invalid string table offset
----------------
jh7370 wrote:

```suggestion
# WARN: warning: '[[FILE]]': invalid string table offset
```


https://github.com/llvm/llvm-project/pull/125679