* Set MaxStoresPerMemcpy and MaxStoresPerMemset to 2.
* Optimize stores of replicated values in SystemZ::combineSTORE(). This
handles the now expanded memory operations and as well some other
pre-existing cases.
* Reject a big displacement in isLegalAddressingMode() for a vector type.
* Return true from shouldConsiderGEPOffsetSplit().
Reviewed By: Ulrich Weigand
Differential Revision: https://reviews.llvm.org/D122105
