Remove some unnecessary invisible delimiter checks.

These seem to have no useful effect... they don't seem useful from a
code inspection point of view, and they affect anything in the test
suite.

compiler/rustc_parse/src/parser/diagnostics.rs

@@ -2109,8 +2109,7 @@ impl<'a> Parser<'a> {
                     brace_depth -= 1;
                     continue;
                 }
-            } else if self.token == token::Eof || self.eat(&token::CloseDelim(Delimiter::Invisible))
-            {
+            } else if self.token == token::Eof {
                 return;
             } else {
                 self.bump();