[VPlan] Allow truncation for lanes in VPScalarIVStepsRecipe (#175268) VPScalarIVStepsRecipe relies on APInt truncation in order to vectorize blocks with a width greater than the maximum value the types of some of their (changing) operands are able to hold (e.g., an i1 input with a vector width of 4). Simply reenable implicit truncation in ConstantInt::get() to cover this case. Remove the helper function given it is only called in one place to prevent accidentally using it elsewhere where we probably do not want implicit truncation turned on. This fixes another case that we saw after acb78bde6fb613a9af2a604bc69fa744a8cee850 did not fix that issue, which had the same stack trace. We still want to keep lane constants as unsigned. Somewhat similar to 6d1e7d4982fabc9e245897056a5425496df6a7a3. This test case comes from a tensorflow/XLA compilation from a test case in https://github.com/google-research/spherical-cnn.
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