Avoid double profile udpate in try_peel_loop

Avoid double profile udpate in try_peel_loop

try_peel_loop uses gimple_duplicate_loop_body_to_header_edge which subtracts the profile
from the original loop. However then it tries to scale the profile in a wrong way
(it forces header count to be entry count).

This eliminates to profile misupdates in the internal loop of sphinx3.

gcc/ChangeLog:

	PR middle-end/110649
	* tree-ssa-loop-ivcanon.cc (try_peel_loop): Avoid double profile update.