core: Restore debug info before function call is invoked

Previously, the IR which sets up the call to the target function will
have its debug location pointing at the last argument of the function
call instead of the function call itself.

nac3core/src/codegen/expr.rs

@@ -365,6 +365,15 @@ impl<'ctx, 'a> CodeGenContext<'ctx, 'a> {
         let mut loc_params: Vec<BasicValueEnum<'ctx>> = Vec::new();
         let mut return_slot = None;
 
+        let loc = self.debug_info.0.create_debug_location(
+            self.ctx,
+            self.current_loc.row as u32,
+            self.current_loc.column as u32,
+            self.debug_info.2,
+            None,
+        );
+        self.builder.set_current_debug_location(loc);
+
         if fun.count_params() > 0 {
             let sret_id = Attribute::get_named_enum_kind_id("sret");
             let byref_id = Attribute::get_named_enum_kind_id("byref");
@@ -1648,6 +1657,10 @@ pub fn gen_expr<'ctx, 'a, G: CodeGenerator>(
                             _ => unreachable!("option must be static or ptr")
                         }
                     }
+
+                    // Reset current_loc back to the location of the call
+                    ctx.current_loc = expr.location;
+
                     return Ok(generator
                         .gen_call(
                             ctx,