Enhance error diagnostics in safe_pop() to provide context about failed pops

[iihimanshuu]

Issue Description:

The safe_pop() utility function line 64 in llvmliteir.py silently returns None when the stack is empty, making debugging difficult when code paths don't push values correctly. Currently, this can hide bugs in visitor dispatch. Improvements:

• Add optional logging/warnings when pop fails
• Provide context about which operation failed
• Helps catch visitor implementation bugs early

Change needed:

Enhance the safe_pop() function to optionally log or raise an exception with context when popping from an empty stack, particularly useful during development and debugging.