[X86] Pull out target constant splat helper function. NFCI.
The code in LowerScalarImmediateShift is just a more powerful version of ISD::isConstantSplatVector. llvm-svn: 344451
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The code in LowerScalarImmediateShift is just a more powerful version of ISD::isConstantSplatVector. llvm-svn: 344451