[mono] Unaligned read/write only when NO_UNALIGNED_ACCESS is set (#91813)

* unaligned read/store only on platforms not supporting it

Author: matouskozak

src/mono/mono/mini/memory-access.c

@@ -481,6 +481,7 @@ mini_emit_memory_load (MonoCompile *cfg, MonoType *type, MonoInst *src, int offs
 	/* LLVM can handle unaligned loads and stores, so there's no reason to
 	 * manually decompose an unaligned load here into a memcpy if we're
 	 * using LLVM. */
+#ifdef NO_UNALIGNED_ACCESS
 	if ((ins_flag & MONO_INST_UNALIGNED) && !COMPILE_LLVM (cfg)) {
 		MonoInst *addr, *tmp_var;
 		int align;
@@ -498,9 +499,10 @@ mini_emit_memory_load (MonoCompile *cfg, MonoType *type, MonoInst *src, int offs
 
 		mini_emit_memcpy_const_size (cfg, addr, src, size, 1);
 		EMIT_NEW_TEMPLOAD (cfg, ins, tmp_var->inst_c0);
-	} else {
+	} else 
+#endif
 		EMIT_NEW_LOAD_MEMBASE_TYPE (cfg, ins, type, src->dreg, offset);
-	}
+	
 	ins->flags |= ins_flag;
 
 	if (ins_flag & MONO_INST_VOLATILE) {
@@ -524,14 +526,17 @@ mini_emit_memory_store (MonoCompile *cfg, MonoType *type, MonoInst *dest, MonoIn
 	if (!(ins_flag & MONO_INST_NONULLCHECK))
 		MONO_EMIT_NULL_CHECK (cfg, dest->dreg, FALSE);
 
+#ifdef NO_UNALIGNED_ACCESS
 	if ((ins_flag & MONO_INST_UNALIGNED) && !COMPILE_LLVM (cfg)) {
 		MonoInst *addr, *mov, *tmp_var;
 
 		tmp_var = mono_compile_create_var (cfg, type, OP_LOCAL);
 		EMIT_NEW_TEMPSTORE (cfg, mov, tmp_var->inst_c0, value);
 		EMIT_NEW_VARLOADA (cfg, addr, tmp_var, tmp_var->inst_vtype);
 		mini_emit_memory_copy_internal (cfg, dest, addr, mono_class_from_mono_type_internal (type), 1, FALSE, (ins_flag & MONO_INST_STACK_STORE) != 0);
-	} else {
+	} else 
+#endif
+	{
 		MonoInst *ins;
 
 		/* FIXME: should check item at sp [1] is compatible with the type of the store. */