[mlir] Making verification after parsing optional

This is very useful when you want to parse IR even if
its invalid (e.g. bytecode). It's also useful if you don't
want to pay the cost of verification in certain situations.

Differential Revision: https://reviews.llvm.org/D134847

mlir/lib/Bytecode/Reader/BytecodeReader.cpp

@@ -1408,7 +1408,7 @@ LogicalResult BytecodeReader::parseIRSection(ArrayRef<uint8_t> sectionData,
   }
 
   // Verify that the parsed operations are valid.
-  if (failed(verify(*moduleOp)))
+  if (config.shouldVerifyAfterParse() && failed(verify(*moduleOp)))
     return failure();
 
   // Splice the parsed operations over to the provided top-level block.