[interp] avoid exception checkpoint when in thread is in GC Safe state (

mono/mono#16955)

[interp] avoid exception checkpoint when in thread is in GC Safe state 

Usually the interpreter operates in GC Unsafe state. There is an exception however, and that is when it executes a `managed-to-native` wrapper in cooperative (or hybrid) suspend.

The wrapper does essentially:
1. enter GC Safe state via `mono_threads_enter_gc_safe_region_unbalanced`
2. call native function
3. exit GC state via `mono_threads_exit_gc_safe_region_unbalanced`

Usually upon return of a native function call, the interpreter would check for thread interruption and, if applicable, throw an exception.  That, however, would mess with the GC state as the interpreter operates in GC Safe state at this moment.

Note that ignoring thread interruption at that point shouldn't be a problem, because after 3. the `managed-to-native` wrapper will check for thread interruption anyway.

Contributes to mono/mono#16819


Commit migrated from mono/mono@e271591

src/mono/mono/mini/interp/interp.c

@@ -3483,7 +3483,8 @@ interp_exec_method_full (InterpFrame *frame, ThreadContext *context, FrameClause
 			frame->ip = ip;
 
 			sp = do_icall_wrapper (frame, csignature, opcode, sp, target_ip, save_last_error);
-			EXCEPTION_CHECKPOINT;
+			if (mono_thread_is_gc_unsafe_mode ()) /* do not enter EH in GC Safe state */
+				EXCEPTION_CHECKPOINT;
 			CHECK_RESUME_STATE (context);
 			ip += 4;
 			MINT_IN_BREAK;
@@ -5926,7 +5927,8 @@ interp_exec_method_full (InterpFrame *frame, ThreadContext *context, FrameClause
 		MINT_IN_CASE(MINT_ICALL_PPPPPP_P)
 			frame->ip = ip;
 			sp = do_icall_wrapper (frame, NULL, *ip, sp, frame->imethod->data_items [ip [1]], FALSE);
-			EXCEPTION_CHECKPOINT;
+			if (mono_thread_is_gc_unsafe_mode ()) /* do not enter EH in GC Safe state */
+				EXCEPTION_CHECKPOINT;
 			CHECK_RESUME_STATE (context);
 			ip += 2;
 			MINT_IN_BREAK;