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/lineNumber/custom/inTheEndOfLambdaArgumentOfInlineCall.kt

@@ -16,4 +16,4 @@ inline fun baz() {
 
 fun nop() {}
 
-// 2 20 21 3 4 25 26 5 27 6 9 10 11 14 15 17
+// 2 20 21 3 4 25 26 5 22 6 9 10 11 14 15 17

compiler/testData/lineNumber/custom/smapInlineAsInlineArgument.kt

@@ -18,4 +18,4 @@ fun fail() : String {
     throw AssertionError("fail")
 }
 
-// 2 22 3 2 23 5 6 24 5 25 7 10 14 18
+// 2 22 3 2 22 5 6 23 5 24 7 10 14 18