Minor: remove some duplicate test data

Apparently if you add an empty line at the start of the FIR file, that's
not enough of a difference for the test suite to complain about, but
enough for it to not add the FIR_IDENTICAL directive...

compiler/testData/diagnostics/tests/inference/coercionToUnit/coercionWithExpectedTypeAndBound.fir.kt

@@ -1,12 +0,0 @@
-
-fun <T : Number> materializeNumber(): T = TODO()
-
-fun a(): Unit = run {
-    <!NEW_INFERENCE_NO_INFORMATION_FOR_PARAMETER!>materializeNumber<!>()
-}
-
-fun b(): Unit = run {
-    run {
-        <!NEW_INFERENCE_NO_INFORMATION_FOR_PARAMETER!>materializeNumber<!>()
-    }
-}

compiler/testData/diagnostics/tests/inference/coercionToUnit/coercionWithExpectedTypeAndBound.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 fun <T : Number> materializeNumber(): T = TODO()
 
 fun a(): Unit = run {

compiler/testData/diagnostics/tests/inference/coercionToUnit/coercionWithoutExpectedType.fir.kt

@@ -1,18 +0,0 @@
-
-fun <T> materialize(): T = TODO()
-
-fun implicitCoercion() {
-    val a = {
-        // Block is implicitly Unit-coerced, so it is allowed to place statement at the end of lambda
-        if (true) 42
-    }
-
-    val b = l@{
-        return@l
-    }
-
-    val c = l@{
-        // Error: block doesn't have an expected type, so call can't be inferred!
-        return@l <!NEW_INFERENCE_NO_INFORMATION_FOR_PARAMETER!>materialize<!>()
-    }
-}

compiler/testData/diagnostics/tests/inference/coercionToUnit/coercionWithoutExpectedType.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 fun <T> materialize(): T = TODO()
 
 fun implicitCoercion() {

compiler/testData/diagnostics/tests/inference/coercionToUnit/indirectCoercionWithExpectedType.fir.kt

@@ -1,35 +0,0 @@
-
-fun <T> materialize(): T = TODO()
-
-fun a(): Unit = run {
-    run {
-        // Ok, block is coerced, because it has (indirectly) Unit-expected type
-        "hello"
-    }
-}
-
-fun b(): Unit = run {
-    // Ok, expected type is applied
-    materialize()
-}
-
-fun c(): Unit = run {
-    run {
-        // Attention!
-        // In OI expected type 'Unit' isn't applied here because of implementation quirks (note that OI still applies Unit in case 'e')
-        // In NI, it is applied and call is correctly inferred, which is consistent with the previous case
-        materialize()
-    }
-}
-
-fun d(): Unit = run outer@{
-    run inner@{
-        return@inner materialize()
-    }
-}
-
-fun e(): Unit = run outer@{
-    run inner@{
-        return@outer materialize()
-    }
-}

compiler/testData/diagnostics/tests/inference/coercionToUnit/indirectCoercionWithExpectedType.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 fun <T> materialize(): T = TODO()
 
 fun a(): Unit = run {