[llvm] [SPIRV] Fix APInt overflow in memset constant array creation (PR #180189)

[Dmitry Sidorov via llvm-commits]

MrSidims wrote:

Seems like this issue is real: "libomp :: tasking/issue-94260-2.c" and is caused by this patch. Unfortunately IGC compiler error is not really descriptive. @sarnex may I ask you to take a look at the error if you have bandwidth? If not - I'll revert the patch. Probably decision can wait until Monday.

https://github.com/llvm/llvm-project/pull/180189