Auto merge of #140165 - ChrisDenton:rollup-on2dpr5, r=ChrisDenton

Rollup of 8 pull requests

Successful merges:

 - #139617 (Use posix_spawn on cygwin)
 - #139921 (improve diagnostic for raw pointer field access with ->)
 - #140031 (compiletest: Fix deadline bugs in new executor)
 - #140072 (handle function alignment in miri)
 - #140104 (Fix auto diff failing on inherent impl blocks)
 - #140124 (Update books)
 - #140144 (Handle another negated literal in `eat_token_lit`.)
 - #140149 (test_nan: ensure the NAN contant is quiet)

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

tests/pass/fn_align.rs

@@ -0,0 +1,21 @@
+//@compile-flags: -Zmin-function-alignment=8
+#![feature(fn_align)]
+
+// When a function uses `repr(align(N))`, the function address should be a multiple of `N`.
+
+#[repr(align(256))]
+fn foo() {}
+
+#[repr(align(16))]
+fn bar() {}
+
+#[repr(align(4))]
+fn baz() {}
+
+fn main() {
+    assert!((foo as usize).is_multiple_of(256));
+    assert!((bar as usize).is_multiple_of(16));
+
+    // The maximum of `repr(align(N))` and `-Zmin-function-alignment=N` is used.
+    assert!((baz as usize).is_multiple_of(8));
+}