ConstantExpressionVisitor fixes

1. Relational operators are promoted according to JLS, not always to double type (IDEA-199775)
2. Casting to boxed type is disabled, as JLS 15.28 suggests
Result of boxed comparison like (Long)128L == (Long)128L is unknown now as size of boxing cache is not specified in JLS

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/constantExpression/afterLongEquality.java

@@ -0,0 +1,4 @@
+// "Replace '0x7fffffffffffffffL == 0x7ffffffffffffffeL' with constant value 'false'" "true"
+class Test {
+  boolean result = false;
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/constantExpression/beforeLongEquality.java

@@ -0,0 +1,4 @@
+// "Replace '0x7fffffffffffffffL == 0x7ffffffffffffffeL' with constant value 'false'" "true"
+class Test {
+  boolean result = 0x7fffffffffffffffL<caret> == 0x7ffffffffffffffeL;
+}