Rollup merge of rust-lang#76871 - RalfJung:miri-panic-abort, r=dtolnay

support panic=abort in Miri

This is needed for rust-lang/miri#1058 on Windows: we cannot run the inline-assembly versions of `abort`, so fall back to the intrinsic (which Miri supports).

library/panic_abort/src/lib.rs

@@ -46,7 +46,7 @@ pub unsafe extern "C" fn __rust_start_panic(_payload: usize) -> u32 {
                 }
                 __rust_abort();
             }
-        } else if #[cfg(windows)] {
+        } else if #[cfg(all(windows, not(miri)))] {
             // On Windows, use the processor-specific __fastfail mechanism. In Windows 8
             // and later, this will terminate the process immediately without running any
             // in-process exception handlers. In earlier versions of Windows, this