Remove trailing semicolons from several macro definitions (#938)

The x86 code contains several macros that following this pattern:

```rust
macro_rules! expr {
    () => { true; }
}

fn bar(_val: bool) {}

fn main() {
    bar(expr!());
}
```

Here, we have a macro `expr!` that expands to tokens sequence with
a trailing semicolon.

Currently, the trailing semicolon is ignored when the macro is invoked
in expression position, due to https://github.com/rust-lang/rust/issues/33953
If this behavior is changed, then a large number of macro invocations in
`stdarch` will stop compiling.

Regardless of whether nor not this change is made, removing the
semicolon more clearly expresses the intent of the code - these macros
are designed to expand to the result of a function call, not ignore its
results (as the `;` would suggest).

0 files changed, 0 insertions, 0 deletions