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diff --git a/test/CodeGen/AArch64/GlobalISel/no-regclass.mir b/test/CodeGen/AArch64/GlobalISel/no-regclass.mir
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+# RUN: llc -O0 -mtriple=aarch64-apple-ios -global-isel -start-before=legalizer -stop-after=instruction-select %s -o - | FileCheck %s
+
+# We run the legalizer to combine the trivial EXTRACT_SEQ pair, leaving %1 and
+# %2 orphaned after instruction-selection (no instructions define or use
+# them). This shouldn't be a problem.
+
+--- |
+ target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
+
+ define void @unused_reg() { ret void }
+
+---
+# CHECK-LABEL: name: unused_reg
+name: unused_reg
+legalized: true
+regBankSelected: true
+tracksRegLiveness: true
+
+# CHECK: body:
+# CHECK: %0 = COPY %w0
+# CHECK: %w0 = COPY %0
+
+body: |
+ bb.0:
+ liveins: %w0
+ %0:gpr(s32) = COPY %w0
+ %1:gpr(s32) = G_SEQUENCE %0(s32), 0
+ %2:gpr(s32) = G_EXTRACT %1(s32), 0
+ %w0 = COPY %2(s32)
+...