Use a less misleading name for the code that sets up the main thread.

Change-Id: I50c1b0a3b633cf8bc40a6bd86f12adb6b91e2888
diff --git a/linker/linker.cpp b/linker/linker.cpp
index 73eeba1..0718efc 100644
--- a/linker/linker.cpp
+++ b/linker/linker.cpp
@@ -3465,7 +3465,7 @@
     _exit(EXIT_FAILURE);
   }
 
-  __libc_init_tls(args);
+  __libc_init_main_thread(args);
 
   // Initialize the linker's own global variables
   linker_so.call_constructors();