Fix crash during typo correction in C mode.

lib/Parse/ParseExpr.cpp

@@ -451,6 +451,10 @@ Parser::ParseRHSOfBinaryExpression(ExprResult LHS, prec::Level MinPrec) {
                                          LHS.get(), TernaryMiddle.get(),
                                          RHS.get());
       }
+      // In this case, ActOnBinOp or ActOnConditionalOp performed the
+      // CorrectDelayedTyposInExpr check.
+      if (!getLangOpts().CPlusPlus)
+        continue;
     }
     // Ensure potential typos aren't left undiagnosed.
     if (LHS.isInvalid()) {

test/Sema/typo-correction.c

@@ -57,3 +57,26 @@ void fn2() {
 }
 
 int d = X ? d : L; // expected-error 2 {{use of undeclared identifier}}
+
+int fn_with_ids() { ID = ID == ID >= ID ; } // expected-error 4 {{use of undeclared identifier}}
+
+int fn_with_rs(int r) { r = TYPO + r * TYPO; } // expected-error 2 {{use of undeclared identifier}}
+
+void fn_with_unknown(int a, int b) {
+  fn_with_unknown(unknown, unknown | unknown); // expected-error 3 {{use of undeclared identifier}}
+}
+
+// Two typos in a parenthesized expression or argument list with a conditional
+// expression caused a crash in C mode.
+//
+// r272587 fixed a similar bug for binary operations. The same fix was needed for
+// conditional expressions.
+
+int g(int x, int y) {
+  return x + y;
+}
+
+int h() {
+  g(x, 5 ? z : 0); // expected-error 2 {{use of undeclared identifier}}
+  (x, 5 ? z : 0);  // expected-error 2 {{use of undeclared identifier}}
+}