[JVM_IR] Give temporary variable loads meaningful offsets.

Temporary variable loads in when expressions had the offsets
of the variable declaration. That leads to hacks during codegen
for line number generation.

Instead of those hacks, give the variable loads the offsets of
the context in which they occur. That avoids the codegen hacks
and fixes stepping behavior for more when expressions.

compiler/tests/org/jetbrains/kotlin/codegen/debugInformation/IrSteppingTestGenerated.java

@@ -427,6 +427,12 @@ public class IrSteppingTestGenerated extends AbstractIrSteppingTest {
         runTest("compiler/testData/debug/stepping/whenComplicatedSubject.kt");
     }
 
+    @Test
+    @TestMetadata("whenIsChecks.kt")
+    public void testWhenIsChecks() throws Exception {
+        runTest("compiler/testData/debug/stepping/whenIsChecks.kt");
+    }
+
     @Test
     @TestMetadata("whenMultiLine.kt")
     public void testWhenMultiLine() throws Exception {
@@ -439,6 +445,12 @@ public class IrSteppingTestGenerated extends AbstractIrSteppingTest {
         runTest("compiler/testData/debug/stepping/whenMultiLineSubject.kt");
     }
 
+    @Test
+    @TestMetadata("whenNullalbeSubject.kt")
+    public void testWhenNullalbeSubject() throws Exception {
+        runTest("compiler/testData/debug/stepping/whenNullalbeSubject.kt");
+    }
+
     @Test
     @TestMetadata("whenSubject.kt")
     public void testWhenSubject() throws Exception {

compiler/tests/org/jetbrains/kotlin/codegen/debugInformation/SteppingTestGenerated.java

@@ -427,6 +427,12 @@ public class SteppingTestGenerated extends AbstractSteppingTest {
         runTest("compiler/testData/debug/stepping/whenComplicatedSubject.kt");
     }
 
+    @Test
+    @TestMetadata("whenIsChecks.kt")
+    public void testWhenIsChecks() throws Exception {
+        runTest("compiler/testData/debug/stepping/whenIsChecks.kt");
+    }
+
     @Test
     @TestMetadata("whenMultiLine.kt")
     public void testWhenMultiLine() throws Exception {
@@ -439,6 +445,12 @@ public class SteppingTestGenerated extends AbstractSteppingTest {
         runTest("compiler/testData/debug/stepping/whenMultiLineSubject.kt");
     }
 
+    @Test
+    @TestMetadata("whenNullalbeSubject.kt")
+    public void testWhenNullalbeSubject() throws Exception {
+        runTest("compiler/testData/debug/stepping/whenNullalbeSubject.kt");
+    }
+
     @Test
     @TestMetadata("whenSubject.kt")
     public void testWhenSubject() throws Exception {