[AMDGPU] Fix expansion of i16 MULH
This commit marks i16 MULH as expand in AMDGPU backend,
which is necessary after the refactoring in D80485.
Differential Revision: https://reviews.llvm.org/D89965
[AMDGPU] Fix expansion of i16 MULH piotr on Oct 22 2020, 7:28 AM. Authored by Tags None Subscribers None
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