[mlir][EmitC] Expand the MemRefToEmitC pass - Lowering `CopyOp` (#151206)

This patch lowers `memref.copy` to `emitc.call_opaque "memcpy"`.
From:
```
func.func @copying(%arg0 : memref<9x4x5x7xf32>, %arg1 : memref<9x4x5x7xf32>) {
  memref.copy %arg0, %arg1 : memref<9x4x5x7xf32> to memref<9x4x5x7xf32>
  return
}
```
To:
```cpp
#include <cstring>
void copying(float v1[9][4][5][7], float v2[9][4][5][7]) {
  size_t v3 = 0;
  float* v4 = &v2[v3][v3][v3][v3];
  float* v5 = &v1[v3][v3][v3][v3];
  size_t v6 = sizeof(float);
  size_t v7 = 1260;
  size_t v8 = v6 * v7;
  memcpy(v5, v4, v8);
  return;
}
```

0 files changed, 0 insertions, 0 deletions