Merge pull request swiftlang#42173 from bnbarham/cherry-disable-cancellation

[5.6][SourceKit] Disable cancellation of in-flight non-completion requests

Author: bnbarham

tools/SourceKit/lib/SwiftLang/SwiftASTManager.cpp

@@ -1050,7 +1050,6 @@ ASTUnitRef ASTBuildOperation::buildASTUnit(std::string &Error) {
     Error = "compilation setup failed";
     return nullptr;
   }
-  CompIns.getASTContext().CancellationFlag = CancellationFlag;
   if (CompIns.loadStdlibIfNeeded()) {
     LOG_WARN_FUNC("Loading the stdlib failed");
     Error = "Loading the stdlib failed";

unittests/SourceKit/SwiftLang/CursorInfoTest.cpp

@@ -417,7 +417,8 @@ TEST_F(CursorInfoTest, CursorInfoMustWaitDueTokenRace) {
   EXPECT_EQ(strlen("fog"), Info.Length);
 }
 
-TEST_F(CursorInfoTest, CursorInfoCancelsPreviousRequest) {
+// Disabled until we re-enable cancellation (rdar://91251055)
+TEST_F(CursorInfoTest, DISABLED_CursorInfoCancelsPreviousRequest) {
   // TODO: This test case relies on the following snippet being slow to type 
   // check so that the first cursor info request takes longer to execute than it 
   // takes time to schedule the second request. If that is fixed, we need to 
@@ -467,7 +468,8 @@ TEST_F(CursorInfoTest, CursorInfoCancelsPreviousRequest) {
     llvm::report_fatal_error("Did not receive a resonse for the first request");
 }
 
-TEST_F(CursorInfoTest, CursorInfoCancellation) {
+// Disabled until we re-enable cancellation (rdar://91251055)
+TEST_F(CursorInfoTest, DISABLED_CursorInfoCancellation) {
   // TODO: This test case relies on the following snippet being slow to type
   // check so that the first cursor info request takes longer to execute than it
   // takes time to schedule the second request. If that is fixed, we need to