Fix compiler warnings in new wasm modules

Also don't output v8ExecutablePath in js.tests on each project
configuration.

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/CheckIrElementVisitor.kt

@@ -90,6 +90,7 @@ class CheckIrElementVisitor(
     override fun <T> visitConst(expression: IrConst<T>) {
         super.visitConst(expression)
 
+        @Suppress("UNUSED_VARIABLE")
         val naturalType = when (expression.kind) {
             IrConstKind.Null -> {
                 expression.ensureNullable()
@@ -106,9 +107,9 @@ class CheckIrElementVisitor(
             IrConstKind.Double -> irBuiltIns.doubleType
         }
 
-        var type = expression.type
         /*
         TODO: This check used to have JS inline class helpers. Rewrite it in a common way.
+        var type = expression.type
         while (true) {
             val inlinedClass = type.getInlinedClass() ?: break
             if (getInlineClassUnderlyingType(inlinedClass) == type)

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/InlineClassDeclarationLowering.kt

@@ -272,10 +272,9 @@ class InlineClassLowering(val context: CommonBackendContext) {
     }
 
     private fun IrFunction.toInlineClassImplementationName(): Name {
-        val klass = this.parentAsClass!!
-        val newName = klass.name.asString() + "__" + name.asString() + INLINE_CLASS_IMPL_SUFFIX
+        val newName = parentAsClass.name.asString() + "__" + name.asString() + INLINE_CLASS_IMPL_SUFFIX
         return when {
-            name.isSpecial -> Name.special("<" + newName + ">")
+            name.isSpecial -> Name.special("<$newName>")
             else -> Name.identifier(newName)
         }
     }