Revert "[CostModel][X86] Support cost kind specific look up tables"

This reverts commit 45846854.

This triggers an assertion failure during Clang selfhost

Unknown type!
UNREACHABLE executed at llvm/lib/CodeGen/ValueTypes.cpp:548!
*** SIGABRT received by PID 6107 (TID 6107) on cpu 218 from PID 6107; stack trace: ***
    @     0x556c8827c2d1         64  llvm::llvm_unreachable_internal()
    @     0x556c82a5542a         32  llvm::MVT::getVT()
    @     0x556c82a54a28         80  llvm::EVT::getEVT()
    @     0x556c7dda1526         80  llvm::TargetLoweringBase::getValueType()
    @     0x556c8174dd38        112  llvm::BasicTTIImplBase<>::getTypeLegalizationCost()
    @     0x556c81755e72        144  llvm::X86TTIImpl::getCmpSelInstrCost()
    @     0x556c8174cadf        512  llvm::TargetTransformInfoImplCRTPBase<>::getInstructionCost()
    @     0x556c84ab4dd2         32  llvm::TargetTransformInfo::getInstructionCost()
    @     0x556c82ead283       1968  llvm::sinkRegion()