[WASM] Initial infrastructure

- New module ":compiler:backend.wasm"
    - Initial compiler infra (driver, phaser, context)
    - Subset of Wasm AST
    - Skeleton of IR -> Wasm AST
    - Wasm AST -> WAT transformer

- Testing infra

- SpiderMonkey jsshell tool

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/compiler.kt

@@ -19,7 +19,7 @@ import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.psi.KtFile
 import org.jetbrains.kotlin.utils.DFS
 
-private fun sortDependencies(dependencies: Collection<IrModuleFragment>): Collection<IrModuleFragment> {
+fun sortDependencies(dependencies: Collection<IrModuleFragment>): Collection<IrModuleFragment> {
     val mapping = dependencies.map { it.descriptor to it }.toMap()
 
     return DFS.topologicalOrder(dependencies) { m ->

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/utils/AnnotationUtils.kt

@@ -23,7 +23,7 @@ object JsAnnotations {
 }
 
 @Suppress("UNCHECKED_CAST")
-private fun IrConstructorCall.getSingleConstStringArgument() =
+fun IrConstructorCall.getSingleConstStringArgument() =
     (getValueArgument(0) as IrConst<String>).value
 
 fun IrAnnotationContainer.getJsModule(): String? =

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/utils/NameTables.kt

@@ -23,7 +23,8 @@ import org.jetbrains.kotlin.utils.addToStdlib.ifNotEmpty
 
 class NameTable<T>(
     val parent: NameTable<T>? = null,
-    private val reserved: MutableSet<String> = mutableSetOf()
+    private val reserved: MutableSet<String> = mutableSetOf(),
+    val sanitizer: (String) -> String = ::sanitizeName
 ) {
     var finished = false
     val names = mutableMapOf<T, String>()
@@ -41,9 +42,10 @@ class NameTable<T>(
         reserved.add(name)
     }
 
-    fun declareFreshName(declaration: T, suggestedName: String) {
-        val freshName = findFreshName(sanitizeName(suggestedName))
+    fun declareFreshName(declaration: T, suggestedName: String): String {
+        val freshName = findFreshName(sanitizer(suggestedName))
         declareStableName(declaration, freshName)
+        return freshName
     }
 
     private fun findFreshName(suggestedName: String): String {