SI-8630 lineToString no longer long by one at eof

One more EOL crasher, or lack-of-EOL crasher, when the text
is at EOF.

It was not caught by the last round of excellent and
thorough tests because

```
// If non-whitespace tokens run all the way up to EOF,
// positions go wrong because the correct end of the last
// token cannot be used as an index into the char array.
// The least painful way to address this was to add a
// newline to the array.
```

1 files changed, 1 insertions, 1 deletions

diff --git a/src/reflect/scala/reflect/internal/util/SourceFile.scala b/src/reflect/scala/reflect/internal/util/SourceFile.scala
index 4fccad74ac..a2642628a4 100644
--- a/src/reflect/scala/reflect/internal/util/SourceFile.scala
+++ b/src/reflect/scala/reflect/internal/util/SourceFile.scala
@@ -40,7 +40,7 @@ abstract class SourceFile {
   def lineToString(index: Int): String = {
     val start = lineToOffset(index)
     var end = start
-    while (!isEndOfLine(end) && end <= length) end += 1
+    while (end < length && !isEndOfLine(end)) end += 1
     new String(content, start, end - start)
   }