Make MIPS assembly labels local.

Avoids the symbols being part of the symbol file and confusing tools like gdb.

Change-Id: If8b24278fafcae5466debc8789e3e2935cf173f6
diff --git a/runtime/arch/mips/jni_entrypoints_mips.S b/runtime/arch/mips/jni_entrypoints_mips.S
index ad7c021..f9ca7df 100644
--- a/runtime/arch/mips/jni_entrypoints_mips.S
+++ b/runtime/arch/mips/jni_entrypoints_mips.S
@@ -44,13 +44,13 @@
     lw    $a2, 8($sp)
     lw    $a3, 12($sp)
     lw    $ra, 16($sp)
-    beq   $v0, $zero, no_native_code_found
+    beq   $v0, $zero, .Lno_native_code_found
     addiu $sp, $sp, 32          # restore the stack
     .cfi_adjust_cfa_offset -32
     move  $t9, $v0              # put method code result in $t9
     jr    $t9                   # leaf call to method's code
     nop
-no_native_code_found:
+.Lno_native_code_found:
     jr    $ra
     nop
 END art_jni_dlsym_lookup_stub