Uncomment require_global_compiler_lock() (#120)

This line was commented when introduced codegen debugging by @DrTodd13.
Uncommenting this line requires modifications in numba-dppy.
It seems that numba-dppy compilation does not work correctly with
global compiler lock.

Author: PokhodenkoSA

numba/core/codegen.py

@@ -220,7 +220,7 @@ def finalize(self):
         Finalization involves various stages of code optimization and
         linking.
         """
-        require_global_compiler_lock()
+        #require_global_compiler_lock()
 
         # Report any LLVM-related problems to the user
         self._codegen._check_llvm_bugs()