testsuite: Move pr104540.C test to g++.target/i386/

Both -mforce-drap and -mstackrealign options are x86 specific.

2022-02-25  Jakub Jelinek  <jakub@redhat.com>

	* g++.dg/pr104540.C: Move to ...
	* g++.target/i386/pr104540.C: ... here.

diff --git a/gcc/testsuite/g++.dg/pr104540.C b/gcc/testsuite/g++.target/i386/pr104540.C
similarity index 100%
rename from gcc/testsuite/g++.dg/pr104540.C
rename to gcc/testsuite/g++.target/i386/pr104540.C