Imported Upstream version 5.18.0.167

Former-commit-id: 289509151e0fee68a1b591a20c9f109c3c789d3a

external/llvm/test/Transforms/InstSimplify/2011-11-23-MaskedBitsCrash.ll

@@ -1,17 +0,0 @@
-; RUN: opt < %s -instsimplify
-
-; The mul can be proved to always overflow (turning a negative value
-; into a positive one) and thus results in undefined behaviour.  At
-; the same time we were deducing from the nsw flag that that mul could
-; be assumed to have a negative value (since if not it has an undefined
-; value, which can be taken to be negative).  We were reporting the mul
-; as being both positive and negative, firing an assertion!
-define i1 @test1(i32 %a) {
-entry:
-  %0 = or i32 %a, 1
-  %1 = shl i32 %0, 31
-  %2 = mul nsw i32 %1, 4
-  %3 = and i32 %2, -4
-  %4 = icmp ne i32 %3, 0
-  ret i1 %4
-}