[X86] updating TTI costs for arithmetic instructions on X86\SLM arch.

updated instructions:
pmulld, pmullw, pmulhw, mulsd, mulps, mulpd, divss, divps, divsd, divpd, addpd and subpd.

special optimization case which replaces pmulld with pmullw\pmulhw\pshuf seq. 
In case if the real operands bitwidth <= 16.

Differential Revision: https://reviews.llvm.org/D28104 

llvm-svn: 291657
diff --git a/llvm/lib/Target/PowerPC/PPCTargetTransformInfo.cpp b/llvm/lib/Target/PowerPC/PPCTargetTransformInfo.cpp
index f778534..f94d1ea 100644
--- a/llvm/lib/Target/PowerPC/PPCTargetTransformInfo.cpp
+++ b/llvm/lib/Target/PowerPC/PPCTargetTransformInfo.cpp
@@ -281,7 +281,7 @@
 int PPCTTIImpl::getArithmeticInstrCost(
     unsigned Opcode, Type *Ty, TTI::OperandValueKind Op1Info,
     TTI::OperandValueKind Op2Info, TTI::OperandValueProperties Opd1PropInfo,
-    TTI::OperandValueProperties Opd2PropInfo) {
+    TTI::OperandValueProperties Opd2PropInfo, ArrayRef<const Value *> Args) {
   assert(TLI->InstructionOpcodeToISD(Opcode) && "Invalid opcode");
 
   // Fallback to the default implementation.