While this isn't specific to Cruz voters, Yougov did poll the question of how non-Clinton and non-Trump primary voters intended to vote in the GE in their national poll conducted ~a week before the election:
More crosstabs…
People who voted in the Dem. primaries:
Clinton 83%
Trump 9%
Stein 3%
Johnson 2%
People who voted in the GOP primaries:
Trump 82%
Clinton 8%
Johnson 5%
Stein 0%
People who supported Sanders in the primaries:
Clinton 68%
Trump 15%
Stein 7%
Johnson 4%
People who supported a Republican candidate other than Trump in the primaries:
Trump 70%
Clinton 11%
Johnson 9%
Stein 0%
97% of those who backed Clinton in the primary still back her in the GE. 97% of those who backed Trump in the primary still back him in the GE.