Fix compilation of JS stdlib

1. Don't import intrinsics when compiling stdlib, use declarations
   from current module instead
2. Add constructor with one argument to SourceFilePathResolver,
   to fix bootstrapping issues.
3. Pass correct source roots to compiler when building
   stdlib, since now we pass module root by default,
   while stdlib source roots are outside of module root.

libraries/stdlib/js/build.gradle

@@ -128,6 +128,7 @@ compileKotlin2Js {
         outputFile = "${buildDir}/classes/main/kotlin.js"
         sourceMap = true
         sourceMapPrefix = "./"
+        freeCompilerArgs += [ "-source-map-base-dirs", [builtinsSrcDir, jsSrcDir, commonSrcDir ].join(File.pathSeparator) ]
     }
 }