[llvm-dev] Issue with getting unsigned Constant from APInt

[Lei Zhang via llvm-dev]

Hi there,

I have been trying to obtain a Constant from an APInt using
```
auto maskConstant = llvm::ConstantInt::get(intTy, maskPiece);
```
where `intTy` is a IntergerType pointer (64-bit) and `maskPiece` is an
APInt object. However, if `maskPiece` has the a big value say
18374686479671623680, which is
1111111100000000000000000000000000000000000000000000000000000000. The
constant will return a negative value -72057594037927936, which looks it is
always converted to a signed integer. How can i keep it as unsigned?

I have also tried `maskConstant = llvm::ConstantInt::get(intTy,
maskPiece.getZExtValue(), false);` or `maskConstant =
llvm::ConstantInt::get(intTy, maskPiece.getZExtValue(), false);`, both
returned the same negative value. Any help will be appreciated.

Best regards,

Leo Z
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