add columns to debug information (#362)

- Add column numbers to debug information.
- Do not build allocas at entry for now.

---------

Signed-off-by: Cyrill Leutwiler <bigcyrill@hotmail.com>

crates/llvm-context/src/polkavm/context/function/runtime/deploy_code.rs

@@ -48,6 +48,7 @@ where
             function_type,
             0,
             Some(inkwell::module::Linkage::External),
+            None,
         )?;
 
         self.inner.declare(context)
@@ -74,7 +75,6 @@ where
         }
 
         context.set_basic_block(context.current_function().borrow().return_block());
-        context.set_debug_location(0, 0, None)?;
         context.build_return(None);
 
         context.pop_debug_scope();

crates/llvm-context/src/polkavm/context/function/runtime/entry.rs

@@ -145,6 +145,7 @@ where
             entry_function_type,
             0,
             Some(inkwell::module::Linkage::External),
+            None,
         )?;
 
         context.declare_global(

crates/llvm-context/src/polkavm/context/function/runtime/runtime_code.rs

@@ -48,6 +48,7 @@ where
             function_type,
             0,
             Some(inkwell::module::Linkage::External),
+            None,
         )?;
 
         self.inner.declare(context)