[llvm] [SelectionDAG][AMDGPU] Negative offset when selecting scratch sv offsets (PR #122251)

[Jay Foad via llvm-commits]

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@@ -1926,7 +1926,7 @@ bool AMDGPUDAGToDAGISel::checkFlatScratchSVSSwizzleBug(
   KnownBits VKnown = CurDAG->computeKnownBits(VAddr);
   KnownBits SKnown =
       KnownBits::add(CurDAG->computeKnownBits(SAddr),
-                     KnownBits::makeConstant(APInt(32, ImmOffset)));
+                     KnownBits::makeConstant(APSInt(32, ImmOffset)));
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jayfoad wrote:

I'd suggest leaving it as `APInt` but passing `/*isSigned=*/ true` as the third argument.

https://github.com/llvm/llvm-project/pull/122251