JVM: fix SMAP range extension logic

If `mapLineNumber` was called in non-monotonic order, e.g. N then N+2
then N+1, the first two calls created a range that spans [N; N+2] but
the third call did not reuse it.

compiler/testData/codegen/boxInline/smap/resolve/inlineComponent.kt

@@ -33,14 +33,12 @@ _2Kt
 zzz/_1Kt
 *L
 1#1,11:1
-7#2:12
-9#2:13
+7#2,3:12
 *E
 *S KotlinDebug
 *F
 + 1 2.kt
 _2Kt
 *L
-6#1:12
-6#1:13
+6#1,3:12
 *E