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implicit_weak_message.cc is part of protobuf_lite.dll, and it includes
wire_format_lite.h, which includes the dllexport inline function
WireFormatLite::WriteGroupToArray which will therefore be emitted.

WriteGroupToArray in turn calls the inline function
InternalWriteGroupToArray, however that definition is provided in the
_inl file. To make sure the definition is available, the _inl file must
be included.

Before Clang r344987 the build worked anyway (due to luck), because
InternalWriteGroupToArray was emitted into other object files (e.g. in
wire_format_lite.obj). After that Clang revision, those definitions
started getting inlined, and so are longer available and cause a link
failure for the reference from implicit_weak_message.obj.

Bug: 901776
Change-Id: I60ba265495eba6e868f0799f697c0d172e4c2fb1
Reviewed-on: https://chromium-review.googlesource.com/c/1317910
Commit-Queue: Hans Wennborg <hans@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605641}