[CoreCLR] Enable dumping FastTiming data with CoreCLR (#9961)

Context: a7b5768
Context: https://github.com/grendello/XAPerfTestRunner

It seems that as part of refactoring and splitting the big CoreCLR
host PR into pieces, the dumping of timing data got disabled for
CoreCLR.

Reenable this feature so that we can measure startup performance of
CoreCLR with grendello/XAPerfTestRunner.

Author: ivanpovazan

src/native/clr/host/host-jni.cc

@@ -1,6 +1,7 @@
 #include <host/host.hh>
 #include <host/host-jni.hh>
 #include <shared/log_types.hh>
+#include <runtime-base/timing-internal.hh>
 
 using namespace xamarin::android;
 
@@ -15,11 +16,9 @@ JNI_OnLoad (JavaVM *vm, void *reserved)
 JNIEXPORT void
 JNICALL Java_mono_android_Runtime_dumpTimingData ([[maybe_unused]] JNIEnv *env, [[maybe_unused]] jclass klass)
 {
-	// if (internal_timing == nullptr) {
-	// 	return;
-	// }
-
-	// internal_timing.dump ();
+	if (FastTiming::enabled ()) [[unlikely]] {
+		internal_timing.dump ();
+	}
 }
 
 JNIEXPORT void

src/native/clr/host/typemap.cc

@@ -212,7 +212,6 @@ auto TypeMapper::typemap_managed_to_java (const char *typeName, const uint8_t *m
 {
 	size_t total_time_index;
 	if (FastTiming::enabled ()) [[unlikely]] {
-		//timing = new Timing ();
 		total_time_index = internal_timing.start_event (TimingEventKind::ManagedToJava);
 	}
 
@@ -257,6 +256,11 @@ auto TypeMapper::find_java_to_managed_entry (hash_t name_hash) noexcept -> const
 [[gnu::flatten]]
 auto TypeMapper::typemap_java_to_managed (const char *java_type_name, char const** assembly_name, uint32_t *managed_type_token_id) noexcept -> bool
 {
+	size_t total_time_index;
+	if (FastTiming::enabled ()) [[unlikely]] {
+		total_time_index = internal_timing.start_event (TimingEventKind::JavaToManaged);
+	}
+
 	if (java_type_name == nullptr || assembly_name == nullptr || managed_type_token_id == nullptr) [[unlikely]] {
 		if (java_type_name == nullptr) {
 			log_warn (
@@ -314,6 +318,10 @@ auto TypeMapper::typemap_java_to_managed (const char *java_type_name, char const
 		optional_string (*assembly_name)
 	);
 
+	if (FastTiming::enabled ()) [[unlikely]] {
+		internal_timing.end_event (total_time_index);
+	}
+
 	return true;
 }
 #endif // ndef DEBUG