Don't generate annotations on synthetic accessor parameters

compiler/testData/codegen/bytecodeListing/annotations/noAnnotationsInSyntheticAccessors.kt

@@ -0,0 +1,13 @@
+annotation class Ann
+
+class Foo private @Ann constructor(@Ann s: String) {
+
+    @Ann
+    private fun foo(@Ann s: String) {}
+
+    companion object {
+        fun foo() {
+            Foo("123").foo("456")
+        }
+    }
+}

compiler/testData/codegen/bytecodeListing/annotations/noAnnotationsInSyntheticAccessors.txt

@@ -0,0 +1,22 @@
+@java.lang.annotation.Retention
+@kotlin.Metadata
+public annotation class Ann
+
+@kotlin.Metadata
+public final class Foo$Companion {
+    inner class Foo$Companion
+    private method <init>(): void
+    public synthetic method <init>(p0: kotlin.jvm.internal.DefaultConstructorMarker): void
+    public final method foo(): void
+}
+
+@kotlin.Metadata
+public final class Foo {
+    public final static field Companion: Foo$Companion
+    inner class Foo$Companion
+    static method <clinit>(): void
+    private @Ann method <init>(@Ann p0: java.lang.String): void
+    public synthetic method <init>(p0: java.lang.String, p1: kotlin.jvm.internal.DefaultConstructorMarker): void
+    public synthetic final static method access$foo(p0: Foo, p1: java.lang.String): void
+    private final @Ann method foo(@Ann p0: java.lang.String): void
+}