Merge #1615

1615: intrinsics: Add early implementation for atomic_store_{seqcst, relaxed, release} r=CohenArthur a=CohenArthur

Needs #1614 so ignore the first commit

This commit adds support for three `atomic_store_*` intrinsics declared
in the core library. The mapping is as follows:

- atomic_store_seqcst(dst, val) -> __atomic_store_n(dst, val,
  __ATOMIC_SEQ_CST)
- atomic_store_relaxed(dst, val) -> __atomic_store_n(dst, val,
  __ATOMIC_RELAXED)
- atomic_store_release(dst, val) -> __atomic_store_n(dst, val,
  __ATOMIC_RELEASE)

The one remaining question is whether `atomic_store_unordered` can be
abstracted as an atomic store with the __ATOMIC_RELAXED ordering.

This commit also performs the overloading "by hand": Replacing
`atomic_store_release<i32>` with `__atomic_store_4` as I cannot get the
generic version to work. This will be done in future improvements.

Co-authored-by: Arthur Cohen <arthur.cohen@embecosm.com>

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