[JVM_IR] Use iinc for incrementing Int variables.

Fix line number generation for assignments where the right-hand
side of the assignment is not on the same line.

Fix line number generation for intrinsics functions where the
function is not on the same line as the last argument.

Be careful to not break stepping behavior with the iinc
optimizations.

compiler/testData/codegen/bytecodeText/iincGeneration.kt

@@ -0,0 +1,41 @@
+fun main(args: Array<String>) {
+    var i = 10
+
+    // -- 4 of these fit in iinc instructions
+    i += 1
+    i += 127
+    i += 128
+    i += -1
+    i += -128
+    i += -129
+
+    // -- 4 of these fit in iinc instructions
+    i -= 1
+    i -= 128
+    i -= 129
+    i -= -1
+    i -= -127
+    i -= -128
+
+    // -- 4 of these fit in iinc instructions
+    i = i + 1
+    i = i + 127
+    i = i + 128
+    i = i + -1
+    i = i + -128
+    i = i + -129
+
+    // -- 4 of these fit in iinc instructions
+    i = i - 1
+    i = i - 128
+    i = i - 129
+    i = i - -1
+    i = i - -127
+    i = i - -128
+}
+
+// JVM_IR_TEMPLATES
+// 16 IINC
+
+// JVM_TEMPLATES
+// 0 IINC

compiler/testData/codegen/bytecodeText/prefixIntVarIncrement.kt

@@ -1,6 +1,3 @@
-// IGNORE_BACKEND: JVM_IR
-// KT-36641 TODO Generate IINC instruction for prefix increment in JVM_IR
-
 fun main(args: Array<String>) {
     var i = 10
     ++i