name b message functions, split battle2

ld_script.txt

@@ -57,6 +57,7 @@ SECTIONS {
         asm/rom3.o(.text);
         src/decompress.o(.text);
         asm/rom_8034C54.o(.text);
+        asm/battle_2.o(.text);
         asm/battle_3.o(.text);
         src/battle_4.o(.text);
         asm/battle_4.o(.text);