fold-const.c (fold): Use "fold" following build in more places.
* fold-const.c (fold): Use "fold" following build in more places. Optimize sqrt(x)*sqrt(x) as x, pow(x,y)*pow(z,y) as pow(x*z,y), pow(x,y)*pow(x,z) as pow(x,y+z) and x/pow(y,z) as x*pow(y,-z). * gcc.dg/builtins-11.c: New test case. From-SVN: r65387
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gcc/testsuite/gcc.dg/builtins-11.c
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