JavaScript: Consolidate Expr tests.

Author: Max Schaefer

javascript/ql/test/library-tests/Expr/LetExpr.expected

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+import javascript
+
+query predicate test_LetExpr(LegacyLetExpr l, int i, VariableDeclarator res0, Expr res1) {
+  res0 = l.getDecl(i) and res1 = l.getBody()
+}

javascript/ql/test/library-tests/Expr/LetExpr.ql

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+import javascript
+
+query predicate test_RelationalComparisons(RelationalComparison rel, Expr res0, Expr res1) {
+  res0 = rel.getLesserOperand() and res1 = rel.getGreaterOperand()
+}

javascript/ql/test/library-tests/Expr/LetExpr.qll

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+import javascript
+
+query predicate test_YieldExpr(YieldExpr yield, string s) {
+  if yield.isDelegating() then s = "delegating" else s = "not delegating"
+}