Extend triggering paths

- add SPIRV dialect definition and implementation
- add serialization/deserialization implementation

Signed-off-by: Davide Grohmann <[email protected]>
Change-Id: Ib63045fec041ba7a2d52b527589c30157ed56258

Author: davidegrohmann

.github/workflows/mlir-spirv-tests.yml

@@ -7,6 +7,9 @@ on:
   workflow_dispatch:
   pull_request:
     paths:
+      - 'mlir/include/mlir/Dialect/SPIRV/**'
+      - 'mlir/lib/Dialect/SPIRV/**'
+      - 'mlir/lib/Target/SPIRV/**'
       - 'mlir/test/Target/SPIRV/**'
       - '.github/workflows/mlir-spirv-tests.yml'