fno-jump-tables isn't enough to guard against
gcc switch optimizations that are unsafe to use
in code that runs before relocation.
The switch-tree-conversion opt pass may generate
lookup tables that are placed in the data section
and accessed via absolute adressing, which fails
prior to relocation.
Signed-off-by: Lucas Stach <dev@lynxeye.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>