[CS] Add IgnoreInvalidASTNode fix for invalid generic argument

Make sure we record a fix here to ensure we don't try to do CSApply
with holes.

Author: hamishknight

lib/Sema/CSGen.cpp

@@ -1981,6 +1981,8 @@ namespace {
                                         /*preparedOverload*/ nullptr));
         if (result->hasError()) {
           auto &ctxt = CS.getASTContext();
+          CS.recordFix(IgnoreInvalidASTNode::create(
+              CS, CS.getConstraintLocator(argLocator)));
           result = PlaceholderType::get(ctxt, specializationArg);
           ctxt.Diags.diagnose(lAngleLoc,
                               diag::while_parsing_as_left_angle_bracket);

validation-test/compiler_crashers_2/d14a9abe37cc3bca.swift renamed to validation-test/compiler_crashers_2_fixed/d14a9abe37cc3bca.swift

@@ -1,4 +1,4 @@
 // {"kind":"typecheck","signature":"swift::constraints::SolverTrail::~SolverTrail()","signatureAssert":"Assertion failed: (Changes.empty() && \"Trail corrupted\"), function ~SolverTrail"}
-// RUN: not --crash %target-swift-frontend -typecheck %s
+// RUN: not %target-swift-frontend -typecheck %s
 enum a< b { case c(}
          func d< b >(b->a< b >) d(a< e >.c let a