Merge pull request #66626 from al45tair/eng/PR-110743884

[Backtracing][Linux] Properly align the stacks.

Author: al45tair

stdlib/public/runtime/Backtrace.cpp

@@ -796,7 +796,7 @@ struct spawn_info {
   int memserver;
 };
 
-uint8_t spawn_stack[4096];
+uint8_t spawn_stack[4096] __attribute__((aligned(SWIFT_PAGE_SIZE)));
 
 int
 do_spawn(void *ptr) {

stdlib/public/runtime/CrashHandlerLinux.cpp

@@ -607,7 +607,7 @@ wait_paused(uint32_t expected, const struct timespec *timeout)
    We don't want to require CAP_SYS_PTRACE because we're potentially being
    used inside of a Docker container, which won't have that enabled. */
 
-char memserver_stack[4096];
+char memserver_stack[4096] __attribute__((aligned(SWIFT_PAGE_SIZE)));
 char memserver_buffer[4096];
 int memserver_fd;
 bool memserver_has_ptrace;