Change hash table load factors

Changed class table and intern table load factors to query the
runtime. The runtime returns load factors based on whether or not we
are a low ram device.

DescriptorEquals time for class linking goes from 10% -> 1.2% for
compiling GmsCore with interpret only.

Added test.

Bug: 24917584

Change-Id: Iaaf5d2eab1b0c2d188d299e4bc1852cdb3801173
diff --git a/runtime/class_table.cc b/runtime/class_table.cc
index fc8e6c4..4b0cbc8 100644
--- a/runtime/class_table.cc
+++ b/runtime/class_table.cc
@@ -21,7 +21,9 @@
 namespace art {
 
 ClassTable::ClassTable() {
-  classes_.push_back(ClassSet());
+  Runtime* const runtime = Runtime::Current();
+  classes_.push_back(ClassSet(runtime->GetHashTableMinLoadFactor(),
+                              runtime->GetHashTableMaxLoadFactor()));
 }
 
 void ClassTable::FreezeSnapshot() {