[win] Fix truncated unwinds for Arm64 Windows

[dpaoliello]

Panic backtraces on ARM64 Windows are truncated because Rust's LLVM configuration sets NoTrapAfterNoreturn = true, which suppresses the generation of brk #0x1 (trap) instructions after calls to noreturn functions. Without this trap instruction, the return address from a noreturn call points past the end of the calling function into an unrelated function, causing RtlLookupFunctionEntry to return the wrong unwind information, which terminates the stack walk prematurely.

In general, NoTrapAfterNoreturn = true is recommended against for Windows, since we have seen security vulnerabilities in the past where an attacker has managed to return from a noreturn function, or the function wasn't actually noereturn, resulting in executing whatever was after the call.

This change disables setting NoTrapAfterNoreturn = true for Windows.

Fixes #140489

[rustbot]

r? @cuviper

rustbot has assigned @cuviper.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

Use r? to explicitly pick a reviewer

Why was this reviewer chosen?

The reviewer was selected based on:

• Owners of files modified in this PR: @cuviper