[PATCH]: Fix ICE in PRE

[Daniel Berlin]

Falk Hueffner pointed this out to me on IRC (so there is no bug report
for it).

Because PRE now can optimize pure and const calls, when you use -O2
-ffast-math, it is going to remove the cos call along the d = 0 path.

double f(double d, double i, int j) { if (j == 1) d = 0; return d *
cos(i); }


In doing so, it needs to regenerate the d *  cos expression in the other
branch, and find_or_generate_expression was ICE'ing because it hadn't
been updated to know that it can generate CALL_EXPR :).

Fixed thusly.


Bootstrapped and currently being regtested on i686-pc-linux-gnu (except
java, which fails to build for me both with and without the patch).
I'll commit this to mainline once it finishes regtesting.

--Dan




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