[roll] Roll fuchsia [libc] Modernize setjmp/longjmp assembly style

This updates the x86 and aarch64 assembly code to use the macros
from <lib/arch/asm.h> and current assembly style conventions, as
the (newer) riscv64 implementation already does.  This purely
cosmetic change does not change the resulting assembled files.

Original-Bug: 342469121
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1197764
Original-Revision: c31ffe3bff8a0244cffd6966a539591c33704fac
GitOrigin-RevId: 448e2d46e167ee2b8edb90a8cc19f2dc805ceaef
Change-Id: Ic939e641040d8ebbb54b82ed27e22335efe55e7d
diff --git a/stem b/stem
index 2dc888d..f803571 100644
--- a/stem
+++ b/stem
@@ -11,7 +11,7 @@
              githooks="integration/git-hooks"
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="e656a9835f91998fe7ce36583a63123e37097555"/>
+             revision="c31ffe3bff8a0244cffd6966a539591c33704fac"/>
   </projects>
   <hooks>
     <hook name="install-environment"