pkg/report: add pattern for Linux #SS faults

On X86-64, dereferencing a non-canonical address normally causes a #GP, for
which syzkaller already has a pattern. However, if the base register of the
non-canonical address is RBP (which can happen in builds that use RBP as a
general-purpose register because they don't use frame pointer unwinding),
#SS is thrown instead, for which syzkaller did not yet have a pattern.

To see this kind of fault, you can insert the following code in
kernel_init() after the call to rcu_end_inkernel_boot():

	asm volatile(
		"movabs $0x8000000000000000, %rbp\n\t"
		"movq (%rbp), %rax\n\t"
		"ud2\n\t"
	);

Linux prints a different error message for #SS, so add that error message
to syzkaller's list of patterns.

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