[Bugfix] Narrow broad exceptions in compilation backends (#31616)

Signed-off-by: c0de128 <kevin.mckay@outlook.com>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Co-authored-by: Cyrus Leung <tlleungac@connect.ust.hk>

vllm/compilation/backends.py

@@ -606,7 +606,7 @@ class VllmBackend:
             try:
                 with open(filepath) as f:
                     hash_content.append(f.read())
-            except Exception:
+            except OSError:
                 logger.warning("Failed to read file %s", filepath)
                 continue
         code_hash = hashlib.sha256("\n".join(hash_content).encode()).hexdigest()