Revert "Load app images"

Fails when a method is duplicated (see test 097-duplicate-method)

Bug: 22858531

This reverts commit f7fd970244f143b1abb956e29794c446e4d57f46.

Change-Id: Ib30ae5be00cc568e799290be6b3c8f29cbbe4c20
diff --git a/compiler/driver/compiler_driver.cc b/compiler/driver/compiler_driver.cc
index 818d50a..d021525 100644
--- a/compiler/driver/compiler_driver.cc
+++ b/compiler/driver/compiler_driver.cc
@@ -730,8 +730,8 @@
 
 bool CompilerDriver::IsImageClass(const char* descriptor) const {
   if (!IsBootImage()) {
-    // NOTE: Currently only reachable from InitImageMethodVisitor for the app image case.
-    return true;
+    // NOTE: Currently unreachable, all callers check IsImage().
+    return false;
   } else {
     return image_classes_->find(descriptor) != image_classes_->end();
   }