Hold dex caches live in class table

Prevents temporary dex caches being unloaded for the same dex file.
Usually this is OK, but if someone resolved a string in that dex
cache, it could leave stale pointers in BSS. Also it can use extra
memory in linear alloc if we allocate dex cache arrays multiple
times.

Bug: 29083330
Change-Id: Ia44668f013ceef1f5eb80f653a48d0f8004548c9
diff --git a/compiler/driver/compiler_driver.cc b/compiler/driver/compiler_driver.cc
index d20f510..0387bcd 100644
--- a/compiler/driver/compiler_driver.cc
+++ b/compiler/driver/compiler_driver.cc
@@ -1057,9 +1057,8 @@
       uint16_t exception_type_idx = exception_type.first;
       const DexFile* dex_file = exception_type.second;
       StackHandleScope<2> hs2(self);
-      Handle<mirror::DexCache> dex_cache(hs2.NewHandle(class_linker->RegisterDexFile(
-          *dex_file,
-          Runtime::Current()->GetLinearAlloc())));
+      Handle<mirror::DexCache> dex_cache(hs2.NewHandle(class_linker->RegisterDexFile(*dex_file,
+                                                                                     nullptr)));
       Handle<mirror::Class> klass(hs2.NewHandle(
           class_linker->ResolveType(*dex_file,
                                     exception_type_idx,
@@ -2089,7 +2088,7 @@
         hs.NewHandle(soa.Decode<mirror::ClassLoader*>(manager_->GetClassLoader())));
     Handle<mirror::DexCache> dex_cache(hs.NewHandle(class_linker->RegisterDexFile(
         dex_file,
-        class_linker->GetOrCreateAllocatorForClassLoader(class_loader.Get()))));
+        class_loader.Get())));
     mirror::Class* klass = class_linker->ResolveType(dex_file, type_idx, dex_cache, class_loader);
 
     if (klass == nullptr) {