Revert of:

Make sure we use the cached sampler header when spliting a SIMD16 sample instruction

Change-Id: I12938ee993a84ea0e23a2ce236623777749d5d27

Author: weiyu-chen

visa/BuildIR.h

@@ -2578,23 +2578,6 @@ class IR_Builder {
 
     G4_Declare* getImmDcl(G4_Imm* val, int numElt);
 
-    int splitSampleInst(VISASampler3DSubOpCode actualop,
-        bool pixelNullMask,
-        bool cpsEnable,
-        G4_Predicate* pred,
-        ChannelMask srcChannel,
-        int numChannels,
-        G4_Operand *aoffimmi,
-        G4_Operand *sampler,
-        G4_Operand *surface,
-        G4_DstRegRegion* dst,
-        Common_VISA_EMask_Ctrl emask,
-        bool useHeader,
-        unsigned numRows, // msg length for each simd8
-        unsigned int numParms,
-        G4_SrcRegRegion ** params,
-        bool uniformSampler = true);
-
 };
 }