Add lit test

Author: ivanradanov

llvm/test/Analysis/ValueTracking/pr152700.ll

@@ -0,0 +1,16 @@
+; Check that we do not crash (see PR #152700)
+; RUN: opt < %s -passes=instcombine
+
+declare noundef i32 @llvm.nvvm.read.ptx.sreg.nctaid.x()
+declare i32 @llvm.umin.i32(i32, i32)
+define i32 @foo(i1 %c, i32 %arg) {
+entry:
+  %i = call i32 @llvm.nvvm.read.ptx.sreg.nctaid.x()
+  br i1 %c, label %bb.1, label %bb.2
+bb.1:
+  br label %bb.2
+bb.2:
+  %phi = phi i32 [ %i, %entry ], [ 0, %bb.1 ]
+  %res = call i32 @llvm.umin.i32(i32 %phi, i32 %arg)
+  ret i32 %res
+}