Revert "bionic: Allocate a shadow call stack for each thread."

This reverts commit da1bc79f937225b1a048d9e5a03eca81680a17fd.

Reason for revert: Caused OOM in media process

Bug: 112907825
Bug: 118593766
Change-Id: I545663871d75889b209b9fd2131cdaa97166478f
diff --git a/libc/bionic/__libc_init_main_thread.cpp b/libc/bionic/__libc_init_main_thread.cpp
index be9d32e..758b295 100644
--- a/libc/bionic/__libc_init_main_thread.cpp
+++ b/libc/bionic/__libc_init_main_thread.cpp
@@ -101,5 +101,5 @@
 
   __init_thread(&main_thread);
 
-  __init_additional_stacks(&main_thread);
+  __init_alternate_signal_stack(&main_thread);
 }