Fix SIGSEGV crashes in DartDumper with bounds checking and null point…

[vicky-dx]

• Add bounds checking in getPoolObjectDescription() for pool array access
• Add null pointer check in DumpObjectPool() before dereferencing pool
• Add safety checks in DumpCode() for analyzedData and iterator bounds
• Add null validation in DumpStructHeaderFile() for UnlinkedCall dartFn
• Add null check in ObjectToString() for kFunctionCid before AsFunction()
• Add try-catch wrapper in Dump4Ida() for better error handling
• Add debug output to track library processing progress

Resolves segmentation fault (signal 11) crashes during object pool dumping, code generation, and IDA script generation phases.