[PATCH] Fix constant folding for one lane vectors (PR15611)

[Silviu Baranga]

Hi,

The attached patch fixes constant folding for one lane vectors,
which is the root cause for PR15611. The faulty code path is
taken by scalarizing vector code during type legalization.

The constant folding code will currently return a scalar when
taking one lane input vectors, which can cause an assertion failure
later.

The changed code was wrong because if the size of the output vector
is 1, we can still be in the case where we need to return a one lane
vector.

Please review!

Thanks,
Silviu
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