GSdx: Add an Enumeration for CRC Hack level

plugins/GSdx/GSTextureCache.cpp

@@ -51,7 +51,7 @@ GSTextureCache::GSTextureCache(GSRenderer* r)
 
 	m_paltex = theApp.GetConfigB("paltex");
 	m_can_convert_depth &= s_IS_OPENGL; // only supported by openGL so far
-	m_crc_hack_level = theApp.GetConfigI("crc_hack_level");
+	m_crc_hack_level = static_cast<CRCHackLevel>(theApp.GetConfigI("crc_hack_level"));
 
 	// In theory 4MB is enough but 9MB is safer for overflow (8MB
 	// isn't enough in custom resolution)
@@ -281,7 +281,7 @@ GSTextureCache::Source* GSTextureCache::LookupSource(const GIFRegTEX0& TEX0, con
 
 						// Gregory: to avoid a massive slow down for nothing, let's only enable
 						// this code when CRC is below the FULL level
-						if (m_crc_hack_level < 3)
+						if (m_crc_hack_level < CRCHackLevel::Full)
 							Read(t, t->m_valid);
 						else
 							dst = t;