[runtime] Fix alignment of HeapObject header on watchOS.
[runtime] Fix alignment of HeapObject header on watchOS.

HeapObject contains an InlineRefCounts. The Swift shim definition of
InlineRefCounts used uint64_t, which has the correct size but the incorrect
alignment on armv7k. This caused the Swift stdlib and the Swift runtime
to disagree about object layouts.

rdar://31664545

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