Ask about compilation pipeline in bug template for github issues

Author: cameel

.github/ISSUE_TEMPLATE/bug_report.md

@@ -25,6 +25,7 @@ assignees: ''
 ## Environment
 
 - Compiler version:
+- Compilation pipeline (legacy, IR, EOF):
 - Target EVM version (as per compiler settings):
 - Framework/IDE (e.g. Truffle or Remix):
 - EVM execution environment / backend / blockchain client: