[musl][PATCH]fix tsd's issue

[=?gb18030?B?zcPX09bt?= <3264430019@qq.com>]

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Currently, I am trying to port jemalloc to musl, I have found a issue "the return value of pthread_getspecific is not correct". The reasons are as follows:
1, Jemalloc uses pthread_key_t to implement cache feature, if codes call malloc, pthread_create_key will called and tsd will be initizlized.
2, Musl calls malloc before updating TLS size in dl stage 3.
3, New created initial_tls doesn't carry builtin_tls's tsd.


The attached patch could fix this issue, please review it, thanks.

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diff --git a/ldso/dynlink.c b/ldso/dynlink.c
index 09f3b0a8..94b8c776 100644
--- a/ldso/dynlink.c
+++ b/ldso/dynlink.c
@@ -2024,9 +2024,12 @@ void __dls3(size_t *sp, size_t *auxv)
 	/* Actual copying to new TLS needs to happen after relocations,
 	 * since the TLS images might have contained relocated addresses. */
 	if (initial_tls != builtin_tls) {
-		if (__init_tp(__copy_tls(initial_tls)) < 0) {
+        pthread_t self = __pthread_self();
+        phtread_t td = __copy_tls(initial_tls);
+		if (__init_tp(td) < 0) {
 			a_crash();
 		}
+        td->tsd = self->tsd;
 	} else {
 		size_t tmp_tls_size = libc.tls_size;
 		pthread_t self = __pthread_self();