JVM_IR KT-45187 use Arrays.copyOf to copy an array in spread operator

Creating a new array (and copying data into it with System.arraycopy)
doesn't work in generic case, because the actual array class depends on
call site.

compiler/tests-gen/org/jetbrains/kotlin/codegen/LightAnalysisModeTestGenerated.java

@@ -32907,6 +32907,11 @@ public class LightAnalysisModeTestGenerated extends AbstractLightAnalysisModeTes
             runTest("compiler/testData/codegen/box/vararg/kt37779.kt");
         }
 
+        @TestMetadata("kt45187.kt")
+        public void testKt45187() throws Exception {
+            runTest("compiler/testData/codegen/box/vararg/kt45187.kt");
+        }
+
         @TestMetadata("kt581.kt")
         public void testKt581() throws Exception {
             runTest("compiler/testData/codegen/box/vararg/kt581.kt");