[NFC][PowerPC] Add a new case to test two-address verification

test/CodeGen/PowerPC/two-address-crash.mir

@@ -0,0 +1,45 @@
+# RUN: not --crash llc -mtriple=ppc32-- %s -run-pass=phi-node-elimination \
+# RUN:   -verify-machineinstrs -o /dev/null 2>&1 | FileCheck %s
+
+--- |
+  define void @VerifyTwoAddressCrash(i16 %div.0.i.i.i.i, i32 %L_num.0.i.i.i.i, i32 %tmp1.i.i206.i.i, i16* %P) {
+    %X = shl i16 %div.0.i.i.i.i, 1
+    %tmp28.i.i.i.i = shl i32 %L_num.0.i.i.i.i, 1
+    %tmp31.i.i.i.i = icmp slt i32 %tmp28.i.i.i.i, %tmp1.i.i206.i.i
+    %tmp31.i.i.i.i.upgrd.1 = zext i1 %tmp31.i.i.i.i to i16
+    %tmp371.i.i.i.i1 = or i16 %tmp31.i.i.i.i.upgrd.1, %X
+    %div.0.be.i.i.i.i = xor i16 %tmp371.i.i.i.i1, 1
+    store i16 %div.0.be.i.i.i.i, i16* %P, align 2
+    ret void
+  }
+
+...
+---
+name:            VerifyTwoAddressCrash
+body:             |
+  bb.0 (%ir-block.0):
+    liveins: $r3, $r4, $r5, $r6
+  
+    %3:gprc_and_gprc_nor0 = COPY killed $r6
+    %2:gprc = COPY killed $r5
+    %1:gprc = COPY killed $r4
+    %0:gprc = COPY killed $r3
+    %4:gprc = RLWINM killed %1, 1, 0, 30
+    %5:crrc = CMPW killed %4, killed %2
+    %6:crbitrc = COPY killed %5.sub_lt
+    %7:gprc_and_gprc_nor0 = LI 0
+    %8:gprc_and_gprc_nor0 = LI 1
+    %9:gprc = ISEL killed %8, killed %7, killed %6
+    %10:gprc = RLWIMI killed %9, killed %0, 1, 0, 30
+    %11:gprc = XORI killed %10, 1
+    STH killed %11, 0, killed %3 :: (store 2 into %ir.P)
+    BLR implicit $lr, implicit $rm
+
+...
+
+# CHECK-LABEL: Bad machine code: Two-address instruction operands must be identical
+# CHECK-NEXT:  - function:    VerifyTwoAddressCrash
+# CHECK-NEXT:  - basic block: %bb.0
+# CHECK-NEXT:  - instruction: %10:gprc = RLWIMI killed %9:gprc(tied-def 0), killed %3:gprc, 1, 0, 30
+# CHECK-NEXT:  - operand 1:   killed %9:gprc(tied-def 0)
+# CHECK-NEXT:  LLVM ERROR: Found 1 machine code errors.