Merge everything into the one global map.

test/test_statusline.vader

@@ -1,9 +1,7 @@
 Before:
-  let g:ale_buffer_loclist_map = {}
   let g:ale_statusline_format = ['%sE', '%sW', 'OKIE']
 
 After:
-  let g:ale_buffer_loclist_map = {}
   let g:ale_buffer_info = {}
 
 Execute (Count should be 0 when data is empty):
@@ -20,19 +18,22 @@ Execute (The count should be correct after an update):
   AssertEqual [0, 0], ale#statusline#Count(44)
 
 Execute (Count should be match the loclist):
-  let g:ale_buffer_info = {bufnr('%'): {}}
-  let g:ale_buffer_loclist_map = {bufnr('%'): [
-  \   {
-  \     'lnum': 1,
-  \     'bufnr': 1,
-  \     'vcol': 0,
-  \     'linter_name': 'testlinter',
-  \     'nr': -1,
-  \     'type': 'E',
-  \     'col': 1,
-  \     'text': 'Test Error',
-  \   },
-  \]}
+  let g:ale_buffer_info = {
+  \ bufnr('%'): {
+  \   'loclist': [
+  \     {
+  \       'lnum': 1,
+  \       'bufnr': 1,
+  \       'vcol': 0,
+  \       'linter_name': 'testlinter',
+  \       'nr': -1,
+  \       'type': 'E',
+  \       'col': 1,
+  \       'text': 'Test Error',
+  \     },
+  \   ],
+  \ },
+  \}
   AssertEqual [1, 0], ale#statusline#Count(bufnr('%'))
 
 Execute (Output should be empty for non-existant buffer):