x86emul: split off opcode 0fae handling

There's a fair amount of sub-cases (with some yet to be implemented), so
a separate function seems warranted.

Code moved gets slightly adjusted in a few places, e.g. replacing EXC_*
by X86_EXC_* (such that EXC_* don't need to move as well; we want these
to be phased out anyway).

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>

tools/fuzz/x86_instruction_emulator/Makefile

@@ -32,7 +32,7 @@ GCOV_FLAGS := --coverage
 	$(CC) -c $(CFLAGS) $(GCOV_FLAGS) $< -o $@
 
 OBJS := fuzz-emul.o x86-emulate.o
-OBJS += x86_emulate/0f01.o
+OBJS += x86_emulate/0f01.o x86_emulate/0fae.o
 
 x86-emulate.h: x86_emulate/x86_emulate.h
 x86-emulate.o x86-emulate-cov.o: x86-emulate.h x86_emulate/x86_emulate.c x86_emulate/private.h