[llvm] Calculate KnownBits from Metadata correctly for vector loads (PR #128908)

[Augie Fackler via llvm-commits]

durin42 wrote:

I keep running out of disk space on my test machine (sigh) when I do debuginfo builds, but with assertions I got as far as ```src/llvm-project/llvm/include/llvm/ADT/APInt.h:1369: void llvm::APInt::setBits(unsigned int, unsigned int): Assertion `loBit <= BitWidth && "loBit out of range"' failed.``` Sadly no stack trace on that though.

https://github.com/llvm/llvm-project/pull/128908