fix regression in panic_misaligned_pointer_dereference

[thomasdangl]

rust-lang#118362 introduced a regression that breaks pointer dereferencing in core.

use std::ptr;

pub fn main() {
    let a: *const u8 = ptr::null();
    dbg!(unsafe { *a });
}

[profile.dev]
panic = "abort"

[build]
target = "x86_64-pc-windows-msvc"

[unstable]
build-std = ["std", "panic_abort"]
build-std-features = ["panic_immediate_abort"]

[target.x86_64-pc-windows-msvc]
linker = "rust-lld.exe"

Until 8de5bd0 this worked totally fine.
However, since the commit ended up in master, the linker is quite unhappy about the symbol:

  = note: rust-lld: error: undefined symbol: core::panicking::panic_misaligned_pointer_dereference::h89d210946737113d
          >>> referenced by C:\Users\User\.rustup\toolchains\nightly-x86_64-pc-windows-msvc\lib\rustlib\src\rust\library\std\src\sys\windows\fs.rs:517
          >>>               libstd-93222e7335411a9e.rlib(std-93222e7335411a9e.std.f1f999d9f794207e-cgu.06.rcgu.o):(std::sys::windows::fs::File::readlink::ha67e29df7ba249d0)
          >>> referenced by C:\Users\User\.rustup\toolchains\nightly-x86_64-pc-windows-msvc\lib\rustlib\src\rust\library\std\src\sys\windows\fs.rs:518
          >>>               libstd-93222e7335411a9e.rlib(std-93222e7335411a9e.std.f1f999d9f794207e-cgu.06.rcgu.o):(std::sys::windows::fs::File::readlink::ha67e29df7ba249d0)
          >>> referenced by C:\Users\User\.rustup\toolchains\nightly-x86_64-pc-windows-msvc\lib\rustlib\src\rust\library\std\src\sys\windows\fs.rs:519
          >>>               libstd-93222e7335411a9e.rlib(std-93222e7335411a9e.std.f1f999d9f794207e-cgu.06.rcgu.o):(std::sys::windows::fs::File::readlink::ha67e29df7ba249d0)
          >>> referenced 33 more times

Is there a specific reason panic_misaligned_pointer_dereference is supposed to be inlined?
Otherwise I suggest we just avoid inlining it for panic_immediate_abort.

Perhaps this is also something to be added as an example for rust-lang#118393.

Best,
Thomas