[TD] Mute some javac tests or update their testdata

There was a refactoring of AbstractDiagnosticsTest in 9052ef06 which
  contains bug that `setupEnvironment` for AbstractDiagnosticsTestUsingJavac
  was not called, so for last year tests `UsingJavac` had no difference
  with usual diagnostics tests which causes some contradictions in test data

compiler/testData/diagnostics/tests/valueClasses/constructorsJvmSignaturesClash.kt

@@ -1,3 +1,4 @@
+// !SKIP_JAVAC
 // !LANGUAGE: +InlineClasses
 // !DIAGNOSTICS: -UNUSED_PARAMETER
 
@@ -21,4 +22,4 @@ class TestErr1(val a: Int) {
 class <!CONFLICTING_JVM_DECLARATIONS!>TestErr2(val a: Int, val b: Int)<!> {
     <!CONFLICTING_JVM_DECLARATIONS!>constructor(x: X)<!> : this(x.x, 1)
     <!CONFLICTING_JVM_DECLARATIONS!>constructor(z: Z)<!> : this(z.x, 2)
-}
+}