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ConstantPoolSDNode, using the target's preferred alignment for the constant type. In LegalizeDAG, when performing loads from the constant pool, the ConstantPoolSDNode's alignment is used in the calls to getLoad and getExtLoad. This change prevents SelectionDAG::getLoad/getExtLoad from incorrectly choosing the ABI alignment for constant pool loads when Alignment == 0. The incorrect alignment is only a performance issue when ABI alignment does not equal preferred alignment (i.e., on x86 it was generating MOVUPS instead of MOVAPS for v4f32 constant loads when the default ABI alignment for 128bit vectors is forced to 1 byte.) Patch by Paul Redmond! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56253 91177308-0d34-0410-b5e6-96231b3b80d8
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