[PATCH v2] ntdll: Return from Thumb to ARM mode after assembling raise_func_trampoline_thumb.

[Mikołaj Zalewski]

Without it, Raspbian gcc thinks the next function
(raise_func_trampoline_arm)
is in Thumb and will create its own trampoline to to execute it as
Thumb (bad).

Signed-off-by: Mikołaj Zalewski