Don't move line and /**/ comments during reformat (KT-18805)

#KT-18805 Fixed

idea/testData/inspectionsLocal/useExpressionBody/convertToExpressionBody/keepComments/2.kt.after

@@ -1,2 +1,2 @@
-fun getText(): String = // let's return xxx
+fun getText(): String =// let's return xxx
         "xxx" //TODO

idea/testData/inspectionsLocal/useExpressionBody/convertToExpressionBody/keepComments/3.kt.after

@@ -1,2 +1,2 @@
-fun getText(): String = // let's return xxx
+fun getText(): String =// let's return xxx
         "xxx"

idea/testData/inspectionsLocal/useExpressionBody/convertToExpressionBody/keepComments/4.kt.after

@@ -1,2 +1,2 @@
-fun getText(): String = /* let's return xxx */
+fun getText(): String =/* let's return xxx */
         "xxx" /* TODO */

idea/testData/inspectionsLocal/useExpressionBody/if.kt.after

@@ -1,6 +1,6 @@
 // HIGHLIGHT: INFORMATION
 
-fun abs(x: Int): Int = // No highlighting here
+fun abs(x: Int): Int =// No highlighting here
         if (x > 0) {
             x
         }