[Beignet] [PATCH] GBE: remove constant expression handling code in gen writer pass.

[Song, Ruiling]

>    ir::Register GenWriter::getConstantRegister(Constant *c, uint32_t
> elemID) {
>      GBE_ASSERT(c != NULL);
>      if(isa<GlobalValue>(c)) {
> @@ -1309,15 +1106,6 @@ error:
>        return reg;
>      }
>
What about put an assert check here?
 GBE_ASSERT(!isa<ConstantExpr>(c));
Other parts looks good to me.

> -    if(isa<ConstantExpr>(c)) {
> -      // Check whether this is a constant drived from a pointer.
> -      Constant *itC = c;
> -      while(isa<ConstantExpr>(itC))
> -        itC = dyn_cast<ConstantExpr>(itC)->getOperand(0);
> -      if (itC->getType()->isPointerTy())
> -        return getConstantPointerRegister(dyn_cast<ConstantExpr>(c),
> elemID);
> -    }
> -
>      const ir::ImmediateIndex immIndex = this->newImmediate(c, elemID);
>      const ir::Immediate imm = ctx.getImmediate(immIndex);
>      const ir::Register reg = ctx.reg(getFamily(imm.getType()));
> --
> 1.9.1
> 
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