Rollup merge of #126929 - nnethercote:rm-__rust_force_expr, r=oli-obk

Remove `__rust_force_expr`.

This was added (with a different name) to improve an error message. It is no longer needed -- removing it changes the error message, but overall I think the new message is no worse:
- the mention of `#` in the first line is a little worse,
- but the extra context makes it very clear what the problem is, perhaps even clearer than the old message,
- and the removal of the note about the `expr` fragment (an internal detail of `__rust_force_expr`) is an improvement.

Overall I think the error is quite clear and still far better than the old message that prompted #61933, which didn't even mention patterns.

The motivation for this is #124141, which will cause pasted metavariables to be tokenized and reparsed instead of the AST node being cached. This change in behaviour occasionally has a non-zero perf cost, and `__rust_force_expr` causes the tokenize/reparse step to occur twice. Removing `__rust_force_expr` greatly reduces the extra overhead for the `deep-vector` benchmark.

r? ```@oli-obk```

0 files changed, 0 insertions, 0 deletions