YAML specification does not allow keys duplication an a mapping. However, YAML
parser in LLVM does not have any check on that and uses only the last key entry.
In this change duplicated keys are merged to satisfy the spec.
Differential Revision: https://reviews.llvm.org/D141848
This will currently accept the old number of bytes syntax, and convert
it to a scalar. This should be removed in the near future (I think I
converted all of the tests already, but likely missed a few).
Not sure what the exact syntax and policy should be. We can continue
printing the number of bytes for non-generic instructions to avoid
test churn and only allow non-scalar types for generic instructions.
This will currently print the LLT in parentheses, but accept parsing
the existing integers and implicitly converting to scalar. The
parentheses are a bit ugly, but the parser logic seems unable to deal
without either parentheses or some keyword to indicate the start of a
type.
