[RISCV][BranchFolding] Precommit test case

Author: michaelmaitland

llvm/test/CodeGen/RISCV/branch_zero.ll

@@ -83,3 +83,22 @@ exit1:
 if.then:
   br label %for.body
 }
+
+define ptr @baz() {
+; CHECK-LABEL: baz:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    beqz zero, .LBB2_2
+; CHECK-NEXT:  # %bb.1: # %if.end12
+; CHECK-NEXT:    li a0, 0
+; CHECK-NEXT:    ret
+; CHECK-NEXT:  .LBB2_2: # %if.then10
+entry:
+  %or.cond = or i1 false, false
+  br i1 %or.cond, label %if.end12, label %if.then10
+
+if.then10:                                        ; preds = %entry
+  unreachable
+
+if.end12:                                         ; preds = %entry
+  ret ptr null
+}