Fix old thinko in choose_multiplier

[Eric Botcazou]

As spotted by the reporter of the bug, there is a small thinko at the end of 
choose_multiplier whereby the (N + 1)th bit of the result is set when the 
computed value is exactly 2**N.  But it turns out that this case can never 
actually happen given how the function is invoked in the compiler.

Bootstrapped/regtested on x86-64/Linux, applied on the mainline as obvious.


2018-07-04  Eric Botcazou  <ebotcazou@adacore.com>

	PR middle-end/86380
	* expmed.c (choose_multiplier): Fix incorrect comparison with mask.

-- 
Eric Botcazou
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