Checking a build_vector for an all-ones value.
Checking a build_vector for an all-ones value.

Type legalization can zero-extend the elements of the build_vector node, so,
for example, we may have an <8 x i8> with i32 elements of value 255. That
should return 'true' for the vector being all ones.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@153203 91177308-0d34-0410-b5e6-96231b3b80d8

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