Enhance CHECK_EQ and friends to allow extra detail to be appended (like CHECK).

Change-Id: Iaa980892ab31621c8bcca9ea7c6c4ee743333f45
diff --git a/src/object.cc b/src/object.cc
index 99cdbc8..9f225d7 100644
--- a/src/object.cc
+++ b/src/object.cc
@@ -648,7 +648,7 @@
 uintptr_t Method::ToNativePC(const uint32_t dex_pc) const {
   const uint32_t* mapping_table = GetMappingTable();
   if (mapping_table == NULL) {
-    DCHECK(dex_pc == 0);
+    DCHECK_EQ(dex_pc, 0U);
     return 0;   // Special no mapping/pc == 0 case
   }
   size_t mapping_table_length = GetMappingTableLength();