x86: Disable sibcall if indirect_return attribute doesn't match

x86: Disable sibcall if indirect_return attribute doesn't match

When shadow stack is enabled, function with indirect_return attribute
may return via indirect jump.  In this case, we need to disable sibcall
if caller doesn't have indirect_return attribute and indirect branch
tracking is enabled since compiler won't generate ENDBR when calling the
caller.

gcc/

	PR target/85620
	* config/i386/i386.cc (ix86_function_ok_for_sibcall): Return
	false if callee has indirect_return attribute and caller
	doesn't.

gcc/testsuite/

	PR target/85620
	* gcc.target/i386/pr85620-2.c: Updated.
	* gcc.target/i386/pr85620-5.c: New test.
	* gcc.target/i386/pr85620-6.c: Likewise.
	* gcc.target/i386/pr85620-7.c: Likewise.