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[NFC][compiler-rt] Factor out __mulo[sdt]i4 implementations to .inc file

Authored by atrosinenko on Aug 27 2020, 3:19 AM.

Description

[NFC][compiler-rt] Factor out __mulo[sdt]i4 implementations to .inc file

The existing implementations are almost identical except for width of the
integer type.

Factor them out to int_mulo_impl.inc for better maintainability.

This patch is almost identical to D86277.

Reviewed By: MaskRay

Differential Revision: https://reviews.llvm.org/D86289