Add a new thread pool pthread priority option.

Also refactor code to not duplicate information.

bug: 79570024
Test: m
Change-Id: Ib5b8c980d34b2ae92530825fceab89fa0e32baa5
diff --git a/runtime/parsed_options.cc b/runtime/parsed_options.cc
index 3aa481a..7383d47 100644
--- a/runtime/parsed_options.cc
+++ b/runtime/parsed_options.cc
@@ -194,6 +194,9 @@
       .Define("-Xjittransitionweight:_")
           .WithType<unsigned int>()
           .IntoKey(M::JITInvokeTransitionWeight)
+      .Define("-Xjitpthreadpriority:_")
+          .WithType<int>()
+          .IntoKey(M::JITPoolThreadPthreadPriority)
       .Define("-Xjitsaveprofilinginfo")
           .WithType<ProfileSaverOptions>()
           .AppendValues()