Fix i1 array global crash in NVPTXAsmPrinter. (#92506)

See the test file. At head, this crashes with

```
assertion failed at llvm/lib/Support/APInt.cpp:492 in
uint64_t llvm::APInt::extractBitsAsZExtValue(unsigned int, unsigned int) const:
  bitPosition < BitWidth && (numBits + bitPosition) <= BitWidth &&
  "Illegal bit extraction"
```