Update CMake min to 3.12

STRING JOIN was introduced in 3.12

TEST=builds with cmake 3.12 fails with 3.10.2 (stock in ubuntu)

Latest Ubuntu PPAs are here: https://apt.kitware.com/

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e65d4dfd0278185962071d30359fc0ce1232be9e by Anush Elangovan <anush@nod-labs.com>:

Fix suprious reference to DLOG

TEST:builds

Closes #89

COPYBARA_INTEGRATE_REVIEW=https://github.com/google/iree/pull/89 from powderluv:fix-cmake-ver e65d4dfd0278185962071d30359fc0ce1232be9e
PiperOrigin-RevId: 276298047
diff --git a/bindings/python/pyiree/vm.cc b/bindings/python/pyiree/vm.cc
new file mode 100644
index 0000000..3d03d97
--- /dev/null
+++ b/bindings/python/pyiree/vm.cc
@@ -0,0 +1,37 @@
+// Copyright 2019 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "bindings/python/pyiree/vm.h"
+
+#include "bindings/python/pyiree/status_utils.h"
+
+namespace iree {
+namespace python {
+
+RtModule CreateModuleFromBlob(std::shared_ptr<OpaqueBlob> blob) {
+  iree_rt_module_t* module;
+  auto free_fn = OpaqueBlob::CreateFreeFn(blob);
+  auto status = iree_vm_bytecode_module_create_from_buffer(
+      {static_cast<const uint8_t*>(blob->data()), blob->size()}, free_fn.first,
+      free_fn.second, IREE_ALLOCATOR_DEFAULT, &module);
+  CheckApiStatus(status, "Error creating vm module from blob");
+  return RtModule::CreateRetained(module);
+}
+
+void SetupVmBindings(pybind11::module m) {
+  m.def("create_module_from_blob", CreateModuleFromBlob);
+}
+
+}  // namespace python
+}  // namespace iree