Warning fixes (casts) and fix Windows build for aligned_alloc #2905

Job	Run time
bazel	5m 25s
macos-latest (make) Release	1m 1s
ubuntu-20.04 (make) Release	2m 43s
ubuntu-latest (make) Release	2m 6s
windows-latest (windows) Release	13m 3s
	24m 18s

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