[interp] Retry cprop pass if killing stloc (mono/mono#17491)

When replacing a stloc with a pop, we should retry the pass, since it is very likely that we will be able to kill the instruction that pushed that value on the stack.

Commit migrated from mono/mono@4419dc9

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

@@ -6540,6 +6540,8 @@ interp_local_deadce (TransformData *td, int *local_ref_count)
 				// We store to a dead stloc, we can replace it with a POP to save local space
 				ins->opcode = MINT_POP;
 				mono_interp_stats.added_pop_count++;
+				// We might to be able to kill both the pop and the instruction pushing the value
+				needs_cprop = TRUE;
 			}
 		}
 	}