Avoid failing TS2695 for eval.

Author: mihailik

src/compiler/checker.ts

@@ -15929,7 +15929,7 @@ namespace ts {
                     checkAssignmentOperator(rightType);
                     return getRegularTypeOfObjectLiteral(rightType);
                 case SyntaxKind.CommaToken:
-                    if (!compilerOptions.allowUnreachableCode && isSideEffectFree(left)) {
+                    if (!compilerOptions.allowUnreachableCode && isSideEffectFree(left) && right.text!=="eval") {
                         error(left, Diagnostics.Left_side_of_comma_operator_is_unused_and_has_no_side_effects);
                     }
                     return rightType;

tests/cases/compiler/evalAfter0.ts

@@ -0,0 +1,3 @@
+(0,eval)("10");
+
+(0,alert)("10");