[mlir][spirv] NFC: Move test passes to test/lib

[antiagainst]

Summary

Previously C++ test passes for SPIR-V were put under
test/Dialect/SPIRV. Move them to test/lib/Dialect/SPIRV
to create a better structure.

Also fixed one of the test pass to use new
PassRegistration mechanism.

[rriddle]

Thanks Lei!

mlir/test/CMakeLists.txt

-add_subdirectory(Dialect)
 add_subdirectory(EDSC)
 add_subdirectory(mlir-cpu-runner)
 add_subdirectory(SDBM)
 add_subdirectory(lib)
 
 llvm_canonicalize_cmake_booleans(
   LLVM_BUILD_EXAMPLES
   )

mlir/test/lib/CMakeLists.txt

 add_subdirectory(DeclarativeTransforms)
+add_subdirectory(Dialect)
 add_subdirectory(IR)
 add_subdirectory(Pass)
 add_subdirectory(TestDialect)
 add_subdirectory(Transforms)

mlir/test/lib/Dialect/SPIRV/TestAvailability.cpp

if (auto capability = dyn_cast<spirv::QueryCapabilityInterface>(op)) {
       os << " ]\n";
     }
     os.flush();
 
     return WalkResult::advance();
   });
 }
 
-static PassRegistration<PrintOpAvailability>
-    printOpAvailabilityPass("test-spirv-op-availability",
-                            "Test SPIR-V op availability");
+namespace mlir {
+void registerPrintOpAvailabilityPass() {
+  PassRegistration<PrintOpAvailability> printOpAvailabilityPass(
+      "test-spirv-op-availability", "Test SPIR-V op availability");
+}
+} // namespace mlir
 
 //===----------------------------------------------------------------------===//
 // Converting target environment pass
 //===----------------------------------------------------------------------===//
 
 namespace {
 /// A pass for testing SPIR-V op availability.
 struct ConvertToTargetEnv : public FunctionPass<ConvertToTargetEnv> {

mlir/tools/mlir-opt/mlir-opt.cpp

 
 namespace mlir {
 // Defined in the test directory, no public header.
 void registerConvertToTargetEnvPass();
 void registerInliner();
 void registerMemRefBoundCheck();
 void registerPassManagerTestPass();
 void registerPatternsTestPass();
+void registerPrintOpAvailabilityPass();
 void registerSimpleParametricTilingPass();
 void registerSymbolTestPasses();
 void registerTestAffineDataCopyPass();
 void registerTestAllReduceLoweringPass();
 void registerTestCallGraphPass();
 void registerTestConstantFold();
 void registerTestFunc();
 void registerTestGpuMemoryPromotionPass();
verifyPasses("verify-each",
                  cl::init(true));
 
 void registerTestPasses() {
   registerConvertToTargetEnvPass();
   registerInliner();
   registerMemRefBoundCheck();
   registerPassManagerTestPass();
   registerPatternsTestPass();
+  registerPrintOpAvailabilityPass();
   registerSimpleParametricTilingPass();
   registerSymbolTestPasses();
   registerTestAffineDataCopyPass();
   registerTestAllReduceLoweringPass();
   registerTestCallGraphPass();
   registerTestConstantFold();
   registerTestFunc();
   registerTestGpuMemoryPromotionPass();