-fsanitize=function: fix alignment fault on Arm targets.

Function pointers are checked by loading a prefix structure from just
before the function's entry point. However, on Arm, the function
pointer is not always exactly equal to the address of the entry point,
because Thumb function pointers have the low bit set to tell the BX
instruction to enter them in Thumb state. So the generated code loads
from an odd address and suffers an alignment fault.

Fixed by clearing the low bit of the function pointer before
subtracting 8.

Differential Revision: https://reviews.llvm.org/D151308