Change KotlinSourceDebugExtension line to take end range as size

Otherwise the range seems to become negative.

Change-Id: Icf0ff9d9caf3280fbdac2436c85a5cc9e17c3aa9

src/main/java/com/android/tools/r8/kotlin/KotlinSourceDebugExtensionParser.java

diff --git a/src/main/java/com/android/tools/r8/kotlin/KotlinSourceDebugExtensionParser.java b/src/main/java/com/android/tools/r8/kotlin/KotlinSourceDebugExtensionParser.java
index fcf1453..a0d4df2 100644
--- a/src/main/java/com/android/tools/r8/kotlin/KotlinSourceDebugExtensionParser.java
+++ b/src/main/java/com/android/tools/r8/kotlin/KotlinSourceDebugExtensionParser.java
@@ -152,7 +152,7 @@
             "Unexpected EOF - no debug line positions");
       }
       // Iterate over the debug line number positions:
-      // <from>#<file>,<to>:<debug-line-position>
+      // <from>#<file>,<range>:<debug-line-position>
       // or
       // <from>#<file>:<debug-line-position>
       reader.readUntil(
@@ -223,18 +223,18 @@
       // The range may have a different end than start.
       String fileAndEndRange = original.substring(fileIndexSplit + 1);
       int endRangeCharPosition = fileAndEndRange.indexOf(',');
-      int originalEnd = originalStart;
+      int size = originalStart;
       if (endRangeCharPosition > -1) {
         // The file should be at least one number wide.
         assert endRangeCharPosition > 0;
-        originalEnd = Integer.parseInt(fileAndEndRange.substring(endRangeCharPosition + 1));
+        size = Integer.parseInt(fileAndEndRange.substring(endRangeCharPosition + 1));
       } else {
         endRangeCharPosition = fileAndEndRange.length();
       }
       int fileIndex = Integer.parseInt(fileAndEndRange.substring(0, endRangeCharPosition));
       Source thisFileSource = builder.files.get(fileIndex);
       if (thisFileSource != null) {
-        Range range = new Range(originalStart, originalEnd);
+        Range range = new Range(originalStart, originalStart + size);
         Position position = new Position(thisFileSource, range);
         Position existingPosition = builder.positions.put(target, position);
         assert existingPosition == null

src/main/java/com/android/tools/r8/naming/Range.java

diff --git a/src/main/java/com/android/tools/r8/naming/Range.java b/src/main/java/com/android/tools/r8/naming/Range.java
index 231a143..c91ae99 100644
--- a/src/main/java/com/android/tools/r8/naming/Range.java
+++ b/src/main/java/com/android/tools/r8/naming/Range.java
@@ -12,6 +12,7 @@
   public Range(int from, int to) {
     this.from = from;
     this.to = to;
+    // TODO(b/145897713): Seems like we should be able to assert from <= to.
   }
 
   public boolean contains(int value) {