[Test] Change indent from four to two spaces in generated tests

This is needed to reduce the size of generated test files, which started
  to exceed default IDE limit

compiler/tests-common/tests/org/jetbrains/kotlin/generators/impl/TestGeneratorImpl.kt

@@ -111,7 +111,7 @@ private class TestGeneratorImplInstance(
 
     private fun generate(): String {
         val out = StringBuilder()
-        val p = Printer(out)
+        val p = Printer(out, indentUnit = Printer.TWO_SPACE_INDENT)
 
         val copyright = File("license/COPYRIGHT_HEADER.txt").readText()
         p.println(copyright)

core/util.runtime/src/org/jetbrains/kotlin/utils/Printer.kt

@@ -145,6 +145,7 @@ open class Printer private constructor(
 
     companion object {
         private const val DEFAULT_INDENTATION_UNIT = "    "
+        const val TWO_SPACE_INDENT = "  ";
 
         @JvmField
         val LINE_SEPARATOR: String = System.getProperty("line.separator")

generators/test-generator/tests/org/jetbrains/kotlin/generators/NewTestGeneratorImpl.kt

@@ -123,7 +123,7 @@ class NewTestGeneratorImpl(
 
         private fun generate(): String {
             val out = StringBuilder()
-            val p = Printer(out)
+            val p = Printer(out, indentUnit = Printer.TWO_SPACE_INDENT)
 
             val copyright = File("license/COPYRIGHT_HEADER.txt").takeIf { it.exists() }?.readText() ?: ""
             p.println(copyright)