[mlir] Silence error: call to constructor of 'llvm::APInt' is ambiguous

I was getting this error when using Clang 9.0.1 for compiling.

F:\llvm-project\mlir\lib\IR\Builders.cpp(119,27): error: call to constructor of 'llvm::APInt' is ambiguous
                          APInt(32, value, /*isSigned=*/false));
                          ^     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
F:\llvm-project\llvm\include\llvm/ADT/APInt.h(277,3): note: candidate constructor
  APInt(unsigned numBits, uint64_t val, bool isSigned = false)
  ^
F:\llvm-project\llvm\include\llvm/ADT/APInt.h(304,3): note: candidate constructor
  APInt(unsigned numBits, unsigned numWords, const uint64_t bigVal[]);
  ^
1 error generated.