Optimize VEC_PERM_EXPR with same permutation index and operation

Optimize VEC_PERM_EXPR with same permutation index and operation

The sequence
     c1 = VEC_PERM_EXPR (a, a, mask)
     c2 = VEC_PERM_EXPR (b, b, mask)
     c3 = c1 op c2
can be optimized to
     c = a op b
     c3 = VEC_PERM_EXPR (c, c, mask)
for all integer vector operation, and float operation with
full permutation.

gcc/ChangeLog:

	PR target/98167
	* match.pd: New perm + vector op patterns for int and fp vector.

gcc/testsuite/ChangeLog:

	PR target/98167
	* gcc.target/i386/pr98167.c: New test.