Cleanup "Beginning of LLVM backend for ART."

Change-Id: I290e4d46b880256b6bf2eae7b3c828ee8d7595f2
diff --git a/src/compiler_llvm/ir_builder.h b/src/compiler_llvm/ir_builder.h
index 2b4095c..a88b16d 100644
--- a/src/compiler_llvm/ir_builder.h
+++ b/src/compiler_llvm/ir_builder.h
@@ -110,6 +110,7 @@
       return getJTypeInArraySpace(jty);
     }
 
+    LOG(FATAL) << "Unknown type space: " << space;
     return NULL;
   }
 
@@ -201,6 +202,7 @@
   llvm::Constant* getJZero(JType jty) {
     switch (jty) {
     case kVoid:
+      LOG(FATAL) << "Zero is not a value of void type";
       return NULL;
 
     case kBoolean: