IR text tests: Don't dump signatures for local declarations

1. Local declarations don't participate in IR-linkage, because they
can be referenced only inside the same body -> can be dropped
from IR text tests.

2. Mangled names for private declarations computed by descriptors/fir
are actually not used anywhere (they are recomputed by IR
immediately before serialization of IR). But sometimes such
mangled names diverge between K1 and K2 -> don't check them, but
always check mangled names computed by IR even for private
declarations.

3. Also: Drop DUMP_LOCAL_DECLARATION_SIGNATURES test directive.

^KT-57428 Obsolete
^KT-57430 Obsolete
^KT-57434 Obsolete
^KT-57778 Obsolete
^KT-57775 Obsolete

compiler/testData/ir/irText/declarations/localClassWithOverrides.sig.kt.txt

@@ -3,93 +3,4 @@
 //   Public signature: /outer|1607449560170809066[0]
 //   Public signature debug description: outer(){}
 fun outer(): Unit
-  // CHECK:
-  //   Mangled name: #outer(){}.ALocal
-  //   Mangled name for the signature: outer(){}
-  local abstract class ALocal {
-    // CHECK:
-    //   Mangled name: #outer(){}.ALocal#<init>(){}
-    //   Mangled name for the signature: outer(){}<init>(){}
-    constructor() /* primary */
-
-    // CHECK:
-    //   Mangled name: #outer(){}.ALocal#afun(){}
-    //   Mangled name for the signature: outer(){}afun(){}
-    abstract fun afun(): Unit
-
-    // CHECK:
-    //   Mangled name: #outer(){}.ALocal{}aval
-    //   Mangled name for the signature: outer(){}{}aval
-    abstract val aval: Int
-      // CHECK JVM_IR:
-      //   Mangled name: #outer(){}.ALocal#<get-aval>(){}kotlin.Int
-      //   Mangled name for the signature: outer(){}<get-aval>(){}kotlin.Int
-      // CHECK JS_IR NATIVE:
-      //   Mangled name: #outer(){}.ALocal#<get-aval>(){}
-      //   Mangled name for the signature: outer(){}<get-aval>(){}
-      abstract get
-
-    // CHECK:
-    //   Mangled name: #outer(){}.ALocal{}avar
-    //   Mangled name for the signature: outer(){}{}avar
-    abstract var avar: Int
-      // CHECK JVM_IR:
-      //   Mangled name: #outer(){}.ALocal#<get-avar>(){}kotlin.Int
-      //   Mangled name for the signature: outer(){}<get-avar>(){}kotlin.Int
-      // CHECK JS_IR NATIVE:
-      //   Mangled name: #outer(){}.ALocal#<get-avar>(){}
-      //   Mangled name for the signature: outer(){}<get-avar>(){}
-      abstract get
-      // CHECK:
-      //   Mangled name: #outer(){}.ALocal#<set-avar>(kotlin.Int){}
-      //   Mangled name for the signature: outer(){}<set-avar>(kotlin.Int){}
-      abstract set
-
-  }
-
-  // CHECK:
-  //   Mangled name: #outer(){}.Local
-  //   Mangled name for the signature: outer(){}
-  local class Local : ALocal {
-    // CHECK:
-    //   Mangled name: #outer(){}.Local{}aval
-    //   Mangled name for the signature: outer(){}{}aval
-    override val aval: Int
-      field
-      // CHECK JVM_IR:
-      //   Mangled name: #outer(){}.Local#<get-aval>(){}kotlin.Int
-      //   Mangled name for the signature: outer(){}<get-aval>(){}kotlin.Int
-      // CHECK JS_IR NATIVE:
-      //   Mangled name: #outer(){}.Local#<get-aval>(){}
-      //   Mangled name for the signature: outer(){}<get-aval>(){}
-      override get
-
-    // CHECK:
-    //   Mangled name: #outer(){}.Local{}avar
-    //   Mangled name for the signature: outer(){}{}avar
-    override var avar: Int
-      field
-      // CHECK JVM_IR:
-      //   Mangled name: #outer(){}.Local#<get-avar>(){}kotlin.Int
-      //   Mangled name for the signature: outer(){}<get-avar>(){}kotlin.Int
-      // CHECK JS_IR NATIVE:
-      //   Mangled name: #outer(){}.Local#<get-avar>(){}
-      //   Mangled name for the signature: outer(){}<get-avar>(){}
-      override get
-      // CHECK:
-      //   Mangled name: #outer(){}.Local#<set-avar>(kotlin.Int){}
-      //   Mangled name for the signature: outer(){}<set-avar>(kotlin.Int){}
-      override set
-
-    // CHECK:
-    //   Mangled name: #outer(){}.Local#<init>(){}
-    //   Mangled name for the signature: outer(){}<init>(){}
-    constructor() /* primary */
-
-    // CHECK:
-    //   Mangled name: #outer(){}.Local#afun(){}
-    //   Mangled name for the signature: outer(){}afun(){}
-    override fun afun(): Unit
-
-  }