Optimizing: Run gtests without creating the Runtime.

The only Optimizing test that actually needs a Runtime is
the ReferenceTypePropagationTest, so we make it subclass
CommonCompilerTest explicitly and change OptimizingUnitTest
to subclass CommonArtTest for the other tests.

On host, each test that initializes the Runtime takes ~220ms
more than without initializing the Runtime. For example, the
ConstantFoldingTest that has 10 individual tests previously
took over 2.2s to run but without the Runtime initialization
it takes around 3-5ms. On target, running 32-bit gtests on
taimen with run-gtests.sh (single-threaded) goes from
~28m47s to ~26m13s, a reduction of ~9%.

Test: m test-art-host-gtest
Test: run-gtests.sh
Change-Id: I43e50ed58e52cc0ad04cdb4d39801bfbae840a3d

1 files changed, 1 insertions, 1 deletions

diff --git a/compiler/optimizing/optimizing_unit_test.h b/compiler/optimizing/optimizing_unit_test.h
index 61e16800e5..c884f5b0a4 100644
--- a/compiler/optimizing/optimizing_unit_test.h
+++ b/compiler/optimizing/optimizing_unit_test.h
@@ -266,7 +266,7 @@ class OptimizingUnitTestHelper {
   std::vector<HInstruction*> parameters_;
 };
 
-class OptimizingUnitTest : public CommonCompilerTest, public OptimizingUnitTestHelper {};
+class OptimizingUnitTest : public CommonArtTest, public OptimizingUnitTestHelper {};
 
 // Naive string diff data type.
 typedef std::list<std::pair<std::string, std::string>> diff_t;