Add explicit alignment for embedded_end_block #40

Job	Run time
bazel-build-check (ubuntu-latest)	3m 30s
bazel-build-check (ubuntu-latest)	2m 47s
bazel-build-check (macos-latest)	3m 1s
bazel-build-check (macos-latest)	3m 30s
	12m 48s

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