toolchain.inc: Add x86-64 support

For now, share code with x86, and use the "large" code model.
Also align the architecture specific CFLAGS in toolchain.inc
for cosmetics.

Change-Id: Ie84893d3460115802fbd70c28b10e709029c6b4e
Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Signed-off-by: Scott Duplichan <scott@notabs.org>
Reviewed-on: http://review.coreboot.org/8690
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
1 file changed