Compute a better lint_node_id during expansion

When we need to emit a lint at a macro invocation, we currently use the
`NodeId` of its parent definition (e.g. the enclosing function). This
means that any `#[allow]` / `#[deny]` attributes placed 'closer' to the
macro (e.g. on an enclosing block or statement) will have no effect.

This commit computes a better `lint_node_id` in `InvocationCollector`.
When we visit/flat_map an AST node, we assign it a `NodeId` (earlier
than we normally would), and store than `NodeId` in current
`ExpansionData`. When we collect a macro invocation, the current
`lint_node_id` gets cloned along with our `ExpansionData`, allowing it
to be used if we need to emit a lint later on.

This improves the handling of `#[allow]` / `#[deny]` for
`SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` and some `asm!`-related lints.
The 'legacy derive helpers' lint retains its current behavior
(I've inlined the now-removed `lint_node_id` function), since
there isn't an `ExpansionData` readily available.

compiler/rustc_builtin_macros/src/source_util.rs

@@ -159,7 +159,7 @@ pub fn expand_include<'cx>(
         }
     }
 
-    Box::new(ExpandResult { p, node_id: cx.resolver.lint_node_id(cx.current_expansion.id) })
+    Box::new(ExpandResult { p, node_id: cx.current_expansion.lint_node_id })
 }
 
 // include_str! : read the given file, insert it as a literal string expr