[AIEX] s24 load/trunc unitttest

Author: F-Stuckmann

llvm/test/CodeGen/AIE/GlobalISel/combine-trunc-to-s20.mir

@@ -306,3 +306,23 @@ body:             |
 
 ...
 
+---
+name:            G_LOAD_with_G_INTTOPTR_use
+legalized:       false
+body:             |
+  bb.1:
+    liveins: $p0
+    ; CHECK-LABEL: name: G_LOAD_with_G_INTTOPTR_use
+    ; CHECK: liveins: $p0
+    ; CHECK-NEXT: {{  $}}
+    ; CHECK-NEXT: [[COPY:%[0-9]+]]:_(p0) = COPY $p0
+    ; CHECK-NEXT: [[LOAD:%[0-9]+]]:_(s24) = G_LOAD [[COPY]](p0) :: (dereferenceable load (s24), align 4)
+    ; CHECK-NEXT: [[TRUNC:%[0-9]+]]:_(s20) = G_TRUNC [[LOAD]](s24)
+    ; CHECK-NEXT: [[INTTOPTR:%[0-9]+]]:_(p0) = G_INTTOPTR [[TRUNC]](s20)
+    ; CHECK-NEXT: $p0 = COPY [[INTTOPTR]](p0)
+    %0:_(p0) = COPY $p0
+    %1:_(s24) = G_LOAD %0:_(p0) :: (dereferenceable load (s24), align 4)
+    %2:_(s20) = G_TRUNC %1
+    %3:_(p0) = G_INTTOPTR %2
+    $p0 = COPY %3
+...