Fix TLS access in JIT with MUSL (php#13329)

Author: dstogov

ext/opcache/jit/zend_jit_x86.dasc

@@ -2901,6 +2901,14 @@ static int zend_jit_setup(void)
 		asm ("movq _tsrm_ls_cache@gottpoff(%%rip),%0"
 			: "=r" (ret));
 		tsrm_ls_cache_tcb_offset = ret;
+#elif defined(__MUSL__)
+		size_t *ti;
+
+		__asm__(
+			"leaq _tsrm_ls_cache@tlsgd(%%rip), %0\n"
+			: "=a" (ti));
+		tsrm_tls_offset = ti[1];
+		tsrm_tls_index = ti[0] * 8;
 #else
 		size_t *ti;