Remove the useless indirection in mips' __set_tls.

Change-Id: I12e9d6716c42ccbccc9a186441aca0736bb22d05
diff --git a/libc/arch-mips64/syscalls/__set_thread_area.S b/libc/arch-mips64/syscalls/__set_tls.S
similarity index 82%
rename from libc/arch-mips64/syscalls/__set_thread_area.S
rename to libc/arch-mips64/syscalls/__set_tls.S
index c28ee4a..f1c31b4 100644
--- a/libc/arch-mips64/syscalls/__set_thread_area.S
+++ b/libc/arch-mips64/syscalls/__set_tls.S
@@ -2,7 +2,7 @@
 
 #include <private/bionic_asm.h>
 
-ENTRY(__set_thread_area)
+ENTRY(__set_tls)
     .set push
     .set noreorder
     li v0, __NR_set_thread_area
@@ -22,5 +22,5 @@
     j t9
     move ra, t0
     .set pop
-END(__set_thread_area)
-.hidden __set_thread_area
+END(__set_tls)
+.hidden __set_tls