expand-large-divrem cannot handle vector types.
If overly large vector element types survive into
isel, they will likely be scalarized there, but since
isel cannot handle scalar integer types of that size,
it will assert.
Handle vector types in expand-large-divrem by
scalarizing them and then expanding the scalar type
operation. For large vectors, this results in a
*massive* code expansion, but it's better than
asserting.
This reverts commit 6bf1b4e8e0776e6f27013434d8b632016ccc795c.
Requiring a triple does not require moving these to a codegen test directory.
Move these to an x86 specific subdirectory of a transforms test.
