Add MIR test

Author: madhur13490

llvm/test/CodeGen/AArch64/GlobalISel/icmp-trunc.mir

@@ -0,0 +1,19 @@
+
+...
+---
+name:            rev64_mask_1_undef
+alignment:       4
+legalized:       true
+regBankSelected: true
+tracksRegLiveness: true
+body:             |
+  bb.1.entry:
+    liveins: $x0, $x1
+    %0:gpr(s64) = COPY $x0
+    %1:gpr(s32) = G_CONSTANT i32 0
+    %2:gpr(s32) = G_TRUNC %0(s64)
+    %3:gpr(s32) = G_ICMP intpred(eq), %1(s32),  %2(s32)
+    ;%1:_(<2 x s32>) = COPY $d1
+    ;%2:_(<2 x s32>) = G_SHUFFLE_VECTOR %0(<2 x s32>), %1, shufflemask(1, undef)
+    ;$d0 = COPY %2(<2 x s32>)
+    RET_ReallyLR implicit $x0