Auto merge of #60077 - RalfJung:miri-alloc-tests, r=joshtriplett

make liballoc internal test suite mostly pass in Miri

I discovered, to my surprise, that liballoc has two test suites: `liballoc/tests`, and a bunch of stuff embedded directly within liballoc.  The latter was not covered by [miri-test-libstd](https://github.com/RalfJung/miri-test-libstd) yet.  This disables in Miri the tests that Miri cannot support or runs too slowly.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/liballoc/alloc.rs b/src/liballoc/alloc.rs
index f3877e51a66..ddc6481eec7 100644
--- a/src/liballoc/alloc.rs
+++ b/src/liballoc/alloc.rs
@@ -252,6 +252,7 @@ mod tests {
     }
 
     #[bench]
+    #[cfg(not(miri))] // Miri does not support benchmarks
     fn alloc_owned_small(b: &mut Bencher) {
         b.iter(|| {
             let _: Box<_> = box 10;