[mlir][nfc] Fix building mlir_c_runner_utils for Windows

[kernhanda]

Summary

On Windows, building mlir_c_runner_utils doesn't properly export
symbols, thus resulting in an implib not being created, which causes
an error when consuming LLVM from external projects.

Authors: Mason Remy <[e-mail]>

[kernhanda]

This will need to be committed on my behalf.

[rriddle]

Confirming that the authorship is "Mason Remy <[e-mail]>"?

[nicolasvasilache]

Please look at https://reviews.llvm.org/D76031, it is pretty vanilla but I'd rather have someone test it on Windows.

mlir/include/mlir/ExecutionEngine/CRunnerUtils.h

 struct UnrankedMemRefType {
   int64_t rank;
   void *descriptor;
 };
 
 //===----------------------------------------------------------------------===//
 // Small runtime support "lib" for vector.print lowering during codegen.
 //===----------------------------------------------------------------------===//
+extern "C" MLIR_CRUNNERUTILS_EXPORT void print_i32(int32_t i);
+extern "C" MLIR_CRUNNERUTILS_EXPORT void print_i64(int64_t l);
 extern "C" MLIR_CRUNNERUTILS_EXPORT void print_f32(float f);
 extern "C" MLIR_CRUNNERUTILS_EXPORT void print_f64(double d);
 extern "C" MLIR_CRUNNERUTILS_EXPORT void print_open();
 extern "C" MLIR_CRUNNERUTILS_EXPORT void print_close();
 extern "C" MLIR_CRUNNERUTILS_EXPORT void print_comma();
 extern "C" MLIR_CRUNNERUTILS_EXPORT void print_newline();
 
 #endif // EXECUTIONENGINE_CRUNNERUTILS_H_

mlir/lib/ExecutionEngine/CRunnerUtils.cpp

 //===- CRunnerUtils.cpp - Utils for MLIR execution ------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
 // This file implements basic functions to manipulate structured MLIR types at
 // runtime. Entities in this file are meant to be retargetable, including on
 // targets without a C++ runtime, and must be kept C compatible.
 //
 //===----------------------------------------------------------------------===//
 
+#include "mlir/ExecutionEngine/CRunnerUtils.h"
+
 #include <cinttypes>
 #include <cstdio>
 
 // Small runtime support "lib" for vector.print lowering.
 // By providing elementary printing methods only, this
 // library can remain fully unaware of low-level implementation
 // details of our vectors. Also useful for direct LLVM IR output.
 extern "C" void print_i32(int32_t i) { fprintf(stdout, "%" PRId32, i); }
 extern "C" void print_i64(int64_t l) { fprintf(stdout, "%" PRId64, l); }
 extern "C" void print_f32(float f) { fprintf(stdout, "%g", f); }
 extern "C" void print_f64(double d) { fprintf(stdout, "%lg", d); }
 extern "C" void print_open() { fputs("( ", stdout); }
 extern "C" void print_close() { fputs(" )", stdout); }
 extern "C" void print_comma() { fputs(", ", stdout); }
 extern "C" void print_newline() { fputc('\n', stdout); }