Split elf_writer_debug.cc to several files.

Refactoring only. The file has grown significantly over time,
and it is time to split it so it can be better managed.

Change-Id: Idce0231718add722292f4701df353d5baf31de5f
diff --git a/compiler/Android.mk b/compiler/Android.mk
index 414f667..b164942 100644
--- a/compiler/Android.mk
+++ b/compiler/Android.mk
@@ -20,7 +20,7 @@
 
 LIBART_COMPILER_SRC_FILES := \
 	compiled_method.cc \
-	debug/elf_writer_debug.cc \
+	debug/elf_debug_writer.cc \
 	dex/global_value_numbering.cc \
 	dex/gvn_dead_code_elimination.cc \
 	dex/local_value_numbering.cc \