[FixCode] Apply coercion fixit for assignment types' mismatch too

lib/Sema/CSDiag.cpp

@@ -4014,6 +4014,7 @@ bool FailureDiagnosis::diagnoseContextualConversionError() {
   case CTP_ArrayElement:
   case CTP_DictionaryKey:
   case CTP_DictionaryValue:
+  case CTP_AssignSource:
     tryRawRepresentableFixIts(diag, CS, exprType, contextualType,
                               KnownProtocolKind::ExpressibleByIntegerLiteral,
                               expr) ||

test/FixCode/fixits-apply-selector.swift → test/FixCode/fixits-apply-objc.swift

@@ -1,4 +1,4 @@
-// RUN: %target-swift-frontend(mock-sdk: %clang-importer-sdk) -disable-objc-attr-requires-foundation-module -parse %s -emit-fixits-path %t.remap
+// RUN: not %target-swift-frontend(mock-sdk: %clang-importer-sdk) -disable-objc-attr-requires-foundation-module -parse %s -emit-fixits-path %t.remap
 // RUN: c-arcmt-test %t.remap | arcmt-test -verify-transformed-files %s.result
 import ObjectiveC
 
@@ -12,3 +12,12 @@ import ObjectiveC
     takeSel(Selector("mySel"))
   }
 }
+
+func foo(an : Any) {
+  let a1 : AnyObject
+  a1 = an
+  let a2 : AnyObject?
+  a2 = an
+  let a3 : AnyObject!
+  a3 = an
+}

test/FixCode/fixits-apply-objc.swift.result

@@ -0,0 +1,23 @@
+// RUN: not %target-swift-frontend(mock-sdk: %clang-importer-sdk) -disable-objc-attr-requires-foundation-module -parse %s -emit-fixits-path %t.remap
+// RUN: c-arcmt-test %t.remap | arcmt-test -verify-transformed-files %s.result
+import ObjectiveC
+
+// REQUIRES: objc_interop
+
+@objc class Selectors {
+  func takeSel(_: Selector) {}
+  func mySel() {}
+  func test() {
+    takeSel(#selector(Selectors.mySel))
+    takeSel(#selector(Selectors.mySel))
+  }
+}
+
+func foo(an : Any) {
+  let a1 : AnyObject
+  a1 = an as AnyObject
+  let a2 : AnyObject?
+  a2 = an as AnyObject?
+  let a3 : AnyObject!
+  a3 = an as AnyObject!
+}