Add compiling class to the DexCompilationUnit.

Use it to simplify HInstructionBuilder and reduce the
number of class resolution calls.

Test: m test-art-host-gtest
Test: testrunner.py --host --optimizing
Test: Pixel 2 XL boots.
Change-Id: Ib4f9b4ea61235841e653a03a40755a39c7de7504
diff --git a/compiler/optimizing/inliner.cc b/compiler/optimizing/inliner.cc
index dd781c2..f9e9abb 100644
--- a/compiler/optimizing/inliner.cc
+++ b/compiler/optimizing/inliner.cc
@@ -1757,6 +1757,7 @@
                            caller_compilation_unit_.GetClassLoader(),
                            handles_);
 
+  Handle<mirror::Class> compiling_class = handles_->NewHandle(resolved_method->GetDeclaringClass());
   DexCompilationUnit dex_compilation_unit(
       class_loader,
       class_linker,
@@ -1766,7 +1767,8 @@
       method_index,
       resolved_method->GetAccessFlags(),
       /* verified_method */ nullptr,
-      dex_cache);
+      dex_cache,
+      compiling_class);
 
   InvokeType invoke_type = invoke_instruction->GetInvokeType();
   if (invoke_type == kInterface) {