x86/cet: Force -fno-jump-tables for CET-IBT

x86/cet: Force -fno-jump-tables for CET-IBT

Both GCC and Clang have a (mis)feature where, even with
-fcf-protection=branch, jump tables are created using a notrack jump rather
than using endbr's in each case statement.

This is incompatible with the safety properties we want in Xen, and enforced
by not setting MSR_S_CET.NOTRACK_EN.  The consequence is a fatal #CP[endbr].

-fno-jump-tables is generally active as a side effect of
CONFIG_INDIRECT_THUNK (retpoline), but as of c/s 95d9ab461436 ("x86/Kconfig:
introduce option to select retpoline usage"), we explicitly support turning
retpoline off.

Fixes: 3667f7f8f7c4 ("x86: Introduce support for CET-IBT")
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>