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[mlir] Hotfix - Fix Windows build

Authored by nicolasvasilache on Mar 2 2020, 7:47 PM.

Description

[mlir] Hotfix - Fix Windows build

This revision adds a static mlir_c_runner_utils_static library
for the sole purpose of being linked into mlir_runner_utils on
Windows.

It was previously reported that:

`add_llvm_library(mlir_c_runner_utils SHARED CRunnerUtils.cpp)`

produces *only* a dll on windows, the linking of mlir_runner_utils fails
because target_link_libraries is looking for a .lib file as opposed to a
.dll file. I think this may be a case where either we need to use
LINK_LIBS or explicitly build a static lib as well, but I haven't tried
either yet.