Revert "Hash-based dex cache type array."

Reverting to work around some programs crashing with
    Check failed: handle_scope_iface.Get() != nullptr.
though the reason for the failure not yet understood.

Test: m test-art-host
Bug: 34839984
Bug: 30627598
Bug: 34659969
Bug: 30419309

This reverts commit ec7862283dd49f5a58d0ac45960ce27c2f7671b8.

Change-Id: Ifded663633082f1e59e5b6ff2e026dc559bd6b82
diff --git a/compiler/optimizing/builder.h b/compiler/optimizing/builder.h
index 223439b..8cf4089 100644
--- a/compiler/optimizing/builder.h
+++ b/compiler/optimizing/builder.h
@@ -51,10 +51,7 @@
         compiler_driver_(driver),
         compilation_stats_(compiler_stats),
         block_builder_(graph, dex_file, code_item),
-        ssa_builder_(graph,
-                     dex_compilation_unit->GetClassLoader(),
-                     dex_compilation_unit->GetDexCache(),
-                     handles),
+        ssa_builder_(graph, dex_compilation_unit->GetDexCache(), handles),
         instruction_builder_(graph,
                              &block_builder_,
                              &ssa_builder_,
@@ -79,12 +76,10 @@
         code_item_(code_item),
         dex_compilation_unit_(nullptr),
         compiler_driver_(nullptr),
+        null_dex_cache_(),
         compilation_stats_(nullptr),
         block_builder_(graph, nullptr, code_item),
-        ssa_builder_(graph,
-                     handles->NewHandle<mirror::ClassLoader>(nullptr),
-                     handles->NewHandle<mirror::DexCache>(nullptr),
-                     handles),
+        ssa_builder_(graph, null_dex_cache_, handles),
         instruction_builder_(graph,
                              &block_builder_,
                              &ssa_builder_,
@@ -96,7 +91,7 @@
                              /* compiler_driver */ nullptr,
                              /* interpreter_metadata */ nullptr,
                              /* compiler_stats */ nullptr,
-                             handles->NewHandle<mirror::DexCache>(nullptr),
+                             null_dex_cache_,
                              handles) {}
 
   GraphAnalysisResult BuildGraph();
@@ -117,6 +112,8 @@
 
   CompilerDriver* const compiler_driver_;
 
+  ScopedNullHandle<mirror::DexCache> null_dex_cache_;
+
   OptimizingCompilerStats* compilation_stats_;
 
   HBasicBlockBuilder block_builder_;