rustfmt `tests/mir-opt`.

The only non-obvious changes:
- `building/storage_live_dead_in_statics.rs` has a `#[rustfmt::skip]`
  attribute to avoid reformating a table of data.
- Two `.mir` files have slight changes involving line numbers.
- In `unusual_item_types.rs` an `EMIT_MIR` annotation is moved to
  outside a function, which is the usual spot, because `tidy` complains
  if such a comment is indented.

The commit also tweaks the comments in `rustfmt.toml`.

1 files changed, 10 insertions, 2 deletions

diff --git a/tests/mir-opt/inline/inline_options.rs b/tests/mir-opt/inline/inline_options.rs
index 7d7c4f718bd..bd9e0e2d207 100644
--- a/tests/mir-opt/inline/inline_options.rs
+++ b/tests/mir-opt/inline/inline_options.rs
@@ -16,8 +16,16 @@ fn main() {
 
 // Cost is approximately 3 * 25 + 5 = 80.
 #[inline]
-pub fn not_inlined() { g(); g(); g(); }
-pub fn inlined<T>() { g(); g(); g(); }
+pub fn not_inlined() {
+    g();
+    g();
+    g();
+}
+pub fn inlined<T>() {
+    g();
+    g();
+    g();
+}
 
 #[inline(never)]
 fn g() {}