Update dwarf-public-names.ll after LLVM change (#2966)

Update after llvm-project commit 7c72941 ("[llvm][DebugInfo]
Attach object-pointer to DISubprogram declarations (#122742)",
2025-01-17).

Original commit:
KhronosGroup/SPIRV-LLVM-Translator@f5e27fe1aac0c57

Author: svenvh

llvm-spirv/test/DebugInfo/X86/dwarf-public-names.ll

@@ -67,7 +67,7 @@ target triple = "spir64-unknown-unknown"
 
 ; Skip the output to the header of the pubnames section.
 ; LINUX: debug_pubnames
-; LINUX-NEXT: unit_size = 0x0000012b
+; LINUX-NEXT: unit_size =
 
 ; Check for each name in the output.
 ; LINUX-DAG: "ns"