[CS] Replace error type with hole for projected value

Missed this in my previous patch, make sure we replace an error with
a hole if necessary.

Author: hamishknight

lib/Sema/CSSyntacticElement.cpp

@@ -801,6 +801,11 @@ class SyntacticElementConstraintGenerator
     auto wrapperTy = cs.simplifyType(cs.getType(wrapperTypeExpr));
     if (auto *projectedVal = wrappedVar->getPropertyWrapperProjectionVar()) {
       auto projectedTy = computeProjectedValueType(wrappedVar, wrapperTy);
+      // The projected type may have an error, make sure we turn it into a hole
+      // if necessary.
+      ASSERT(!projectedTy->hasUnboundGenericType() &&
+             !projectedTy->hasPlaceholder());
+      projectedTy = cs.replaceInferableTypesWithTypeVars(projectedTy, locator);
       cs.setType(projectedVal, projectedTy);
     }
     if (auto *backing = wrappedVar->getPropertyWrapperBackingProperty())

validation-test/IDE/crashers_fixed/ConstraintSystem-applySolution-bbfc02.swift

@@ -0,0 +1,11 @@
+// {"kind":"complete","original":"3da7ab26","signature":"swift::constraints::ConstraintSystem::applySolution(swift::constraints::Solution&, swift::constraints::SyntacticElementTarget)","signatureAssert":"Assertion failed: (isValidType(solution.simplifyType(type)) && \"node type has invalid type\"), function applySolution"}
+// RUN: %target-swift-ide-test -code-completion -batch-code-completion -skip-filecheck -code-completion-diagnostics -source-filename %s
+@propertyWrapper struct a<b {
+  init(wrappedValue: b)
+projectedValue:
+  var wrappedValue: b
+}
+{
+  @a var c = false
+  switch c {
+    #^^#

validation-test/compiler_crashers_fixed/ConstraintSystem-applySolution-082642.swift

@@ -0,0 +1,10 @@
+// {"kind":"typecheck","signature":"swift::constraints::ConstraintSystem::applySolution(swift::constraints::Solution&, swift::constraints::SyntacticElementTarget)","signatureAssert":"Assertion failed: (isValidType(solution.simplifyType(type)) && \"node type has invalid type\"), function applySolution"}
+// RUN: not %target-swift-frontend -typecheck %s
+@propertyWrapper struct a<b > {
+  init(wrappedValue: b)
+projectedValue:
+  var wrappedValue: b
+}
+{
+  @a var c = false
+}