Change oatexec section to be Function not Object.

This allows the oatexec section to be disassembled by tools like objdump.

Change-Id: Ic9334699d95bc477bb7d3a03e3ff3b2fd275341e
diff --git a/src/elf_writer.cc b/src/elf_writer.cc
index d4f91d6..66a9145 100644
--- a/src/elf_writer.cc
+++ b/src/elf_writer.cc
@@ -157,7 +157,7 @@
 
     ir_builder->AddSymbol(*input,
                           "oatexec",
-                          mcld::ResolveInfo::Object,
+                          mcld::ResolveInfo::Function,
                           mcld::ResolveInfo::Define,
                           mcld::ResolveInfo::Global,
                           oat_code_length,  // size