[MLIR][GPU] Add missing #include to SerializeToHsaco.cpp

llvm/Support/Path.h was likely previously implicitly included, and a
refactoring removed that inclusion, breaking the pass.

Differential Revision: https://reviews.llvm.org/D118508

mlir/lib/Dialect/GPU/Transforms/SerializeToHsaco.cpp

@@ -40,6 +40,7 @@
 
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/FileUtilities.h"
+#include "llvm/Support/Path.h"
 #include "llvm/Support/Program.h"
 #include "llvm/Support/SourceMgr.h"
 #include "llvm/Support/TargetSelect.h"