Replace the trove4j collections usages with the fastutil ones

The trove4j library is licensed under LGPL, and that causes some troubles while working with it. The fastutil library provides the same functionality in the context of our needs, and is licensed under the Apache license.
^KTI-1135 In Progress

js/js.ast/build.gradle.kts

@@ -6,7 +6,7 @@ plugins {
 dependencies {
     api(project(":core:descriptors"))
     compileOnly(intellijCore())
-    compileOnly(commonDependency("org.jetbrains.intellij.deps:trove4j"))
+    compileOnly(commonDependency("org.jetbrains.intellij.deps.fastutil:intellij-deps-fastutil"))
 }
 
 sourceSets {

js/js.ast/src/org/jetbrains/kotlin/js/backend/JsReservedIdentifiers.java

@@ -4,7 +4,7 @@
 
 package org.jetbrains.kotlin.js.backend;
 
-import gnu.trove.THashSet;
+import it.unimi.dsi.fastutil.objects.ObjectOpenHashSet;
 
 import java.util.Collections;
 import java.util.Set;
@@ -142,7 +142,7 @@ public class JsReservedIdentifiers {
                 "$stack", "$stackDepth", "$location",
         };
 
-        reservedGlobalSymbols = new THashSet<String>(commonBuiltins.length);
+        reservedGlobalSymbols = new ObjectOpenHashSet<>(commonBuiltins.length);
         Collections.addAll(reservedGlobalSymbols, commonBuiltins);
     }
 

js/js.ast/src/org/jetbrains/kotlin/js/backend/JsToStringGenerationVisitor.java

@@ -4,6 +4,7 @@
 
 package org.jetbrains.kotlin.js.backend;
 
+import it.unimi.dsi.fastutil.objects.ObjectOpenHashSet;
 import kotlin.text.StringsKt;
 import org.jetbrains.annotations.Nullable;
 import org.jetbrains.kotlin.js.backend.ast.*;
@@ -12,7 +13,6 @@ import org.jetbrains.kotlin.js.backend.ast.JsIntLiteral;
 import org.jetbrains.kotlin.js.backend.ast.JsVars.JsVar;
 import org.jetbrains.kotlin.js.common.IdentifierPolicyKt;
 import org.jetbrains.kotlin.js.util.TextOutput;
-import gnu.trove.THashSet;
 import org.jetbrains.annotations.NotNull;
 
 import java.util.*;
@@ -190,7 +190,7 @@ public class JsToStringGenerationVisitor extends JsVisitor {
      * because the statements designated by statementEnds and statementStarts are
      * those that appear directly within these global blocks.
      */
-    private Set<JsBlock> globalBlocks = new THashSet<JsBlock>();
+    private Set<JsBlock> globalBlocks = new ObjectOpenHashSet<>();
 
     @NotNull
     protected final TextOutput p;