[IR] update testdata: escape special symbols in Char and String constant values

compiler/testData/ir/irText/expressions/kt28006.kt.txt

@@ -1,36 +1,36 @@
 val test1: String
-  field = "🤗"
+  field = "\uD83E\uDD17"
   get
 
 val test2: String
-  field = "🤗🤗"
+  field = "\uD83E\uDD17\uD83E\uDD17"
   get
 
 const val testConst1: String
-  field = "🤗"
+  field = "\uD83E\uDD17"
   get
 
 const val testConst2: String
-  field = "🤗🤗"
+  field = "\uD83E\uDD17\uD83E\uDD17"
   get
 
 const val testConst3: String
-  field = "🤗🤗🤗"
+  field = "\uD83E\uDD17\uD83E\uDD17\uD83E\uDD17"
   get
 
 const val testConst4: String
-  field = "🤗🤗🤗🤗"
+  field = "\uD83E\uDD17\uD83E\uDD17\uD83E\uDD17\uD83E\uDD17"
   get
 
 fun test1(x: Int): String {
-  return "🤗" + x
+  return "\uD83E\uDD17" + x
 }
 
 fun test2(x: Int): String {
-  return x + "🤗"
+  return x + "\uD83E\uDD17"
 }
 
 fun test3(x: Int): String {
-  return x + "🤗" + x
+  return x + "\uD83E\uDD17" + x
 }
 

compiler/testData/ir/irText/expressions/stringTemplates.kt.txt

@@ -23,9 +23,7 @@ val test4: String
   get
 
 val test5: String
-  field = "
-abc
-"
+  field = "\nabc\n"
   get
 
 val test6: String

compiler/testData/ir/irText/firProblems/coercionToUnitForNestedWhen.kt.txt

@@ -1,5 +1,5 @@
 private const val BACKSLASH: Char
-  field = '\'
+  field = '\\'
   private get
 
 private fun Reader.nextChar(): Char? {