Adds ConstantFoldHook registry in MLIRContext

This reverts the previous method which needs to create a new dialect with the
constant fold hook from TensorFlow. This new method uses a function object in
dialect to store the constant fold hook. Once a hook is registered to the
dialect, this function object will be assigned when the dialect is added to the
MLIRContext.

For the operations which are not registered, a new method getRegisteredDialects
is added to the MLIRContext to query the dialects which matches their op name
prefixes.

PiperOrigin-RevId: 222310149
5 files changed
tree: dbe7b40487a2c7f7f2af74ed5e00d46b40cf719e
  1. g3doc/
  2. include/
  3. lib/
  4. test/
  5. tools/
  6. utils/
  7. .clang-format
  8. LICENSE.TXT