Introduce a 'baseline' variant for the compiler.

Implemented as a stripped down version of the optimizing compiler,
not running any optimization.

Adjust code to still work with expectations in code generators.

bug: 111397239

Test: test.py --baseline
Change-Id: I4328283825f9a890616e7496ed4c1e77d6bcc5dd
diff --git a/compiler/jit/jit_compiler.cc b/compiler/jit/jit_compiler.cc
index 3fc559e..bc8641a 100644
--- a/compiler/jit/jit_compiler.cc
+++ b/compiler/jit/jit_compiler.cc
@@ -188,7 +188,7 @@
     TimingLogger::ScopedTiming t2("Compiling", &logger);
     JitCodeCache* const code_cache = runtime->GetJit()->GetCodeCache();
     success = compiler_driver_->GetCompiler()->JitCompile(
-        self, code_cache, method, osr, jit_logger_.get());
+        self, code_cache, method, /* baseline= */ false, osr, jit_logger_.get());
   }
 
   // Trim maps to reduce memory usage.