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/driver/compiler_options_map-inl.h b/compiler/driver/compiler_options_map-inl.h
index 32fc887..9914d81 100644
--- a/compiler/driver/compiler_options_map-inl.h
+++ b/compiler/driver/compiler_options_map-inl.h
@@ -58,6 +58,9 @@
   if (map.Exists(Base::Debuggable)) {
     options->debuggable_ = true;
   }
+  if (map.Exists(Base::Baseline)) {
+    options->baseline_ = true;
+  }
   map.AssignIfExists(Base::TopKProfileThreshold, &options->top_k_profile_threshold_);
   map.AssignIfExists(Base::AbortOnHardVerifierFailure, &options->abort_on_hard_verifier_failure_);
   map.AssignIfExists(Base::AbortOnSoftVerifierFailure, &options->abort_on_soft_verifier_failure_);
@@ -159,6 +162,9 @@
       .Define("--debuggable")
           .IntoKey(Map::Debuggable)
 
+      .Define("--baseline")
+          .IntoKey(Map::Baseline)
+
       .Define("--top-k-profile-threshold=_")
           .template WithType<double>().WithRange(0.0, 100.0)
           .IntoKey(Map::TopKProfileThreshold)