Format libstd with rustfmt

This commit applies rustfmt with rust-lang/rust's default settings to
files in src/libstd *that are not involved in any currently open PR* to
minimize merge conflicts. THe list of files involved in open PRs was
determined by querying GitHub's GraphQL API with this script:
https://gist.github.com/dtolnay/aa9c34993dc051a4f344d1b10e4487e8

With the list of files from the script in outstanding_files, the
relevant commands were:

    $ find src/libstd -name '*.rs' \
        | xargs rustfmt --edition=2018 --unstable-features --skip-children
    $ rg libstd outstanding_files | xargs git checkout --

Repeating this process several months apart should get us coverage of
most of the rest of libstd.

To confirm no funny business:

    $ git checkout $THIS_COMMIT^
    $ git show --pretty= --name-only $THIS_COMMIT \
        | xargs rustfmt --edition=2018 --unstable-features --skip-children
    $ git diff $THIS_COMMIT  # there should be no difference

1 files changed, 7 insertions, 3 deletions

diff --git a/src/libstd/sys_common/util.rs b/src/libstd/sys_common/util.rs
index 7936dd35999..00f7db4c037 100644
--- a/src/libstd/sys_common/util.rs
+++ b/src/libstd/sys_common/util.rs
@@ -16,11 +16,15 @@ pub fn dumb_print(args: fmt::Arguments<'_>) {
 
 pub fn abort(args: fmt::Arguments<'_>) -> ! {
     dumb_print(format_args!("fatal runtime error: {}\n", args));
-    unsafe { crate::sys::abort_internal(); }
+    unsafe {
+        crate::sys::abort_internal();
+    }
 }
 
 #[allow(dead_code)] // stack overflow detection not enabled on all platforms
 pub unsafe fn report_overflow() {
-    dumb_print(format_args!("\nthread '{}' has overflowed its stack\n",
-                            thread::current().name().unwrap_or("<unknown>")));
+    dumb_print(format_args!(
+        "\nthread '{}' has overflowed its stack\n",
+        thread::current().name().unwrap_or("<unknown>")
+    ));
 }