RFR(M): 7133857: exp() and pow() should use the x87 ISA on x86

[Roland Westrelin]

Thanks for taking another look at this.

> Why you need the next move?:
> 
> +      mov(rcx, tmp2);
> +      Label integer;

You're right, I don't need it. Must be some debugging code that I forgot to remove. 

Here is a new webrev that implements your suggestions:
http://cr.openjdk.java.net/~roland/7133857/webrev.04/

Roland.