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.