[Gardening] Remove InImmediateMode

The last reader of this bit was the legacy integrated REPL.

Author: CodaFi

include/swift/Basic/LangOptions.h

@@ -497,11 +497,6 @@ namespace swift {
     /// dumped to llvm::errs().
     bool DebugTimeExpressions = false;
 
-    /// Indicate that the type checker is checking code that will be
-    /// immediately executed. This will suppress certain warnings
-    /// when executing scripts.
-    bool InImmediateMode = false;
-
     /// Indicate that the type checker should skip type-checking non-inlinable
     /// function bodies.
     bool SkipNonInlinableFunctionBodies = false;

lib/Frontend/Frontend.cpp

@@ -311,15 +311,6 @@ bool CompilerInstance::setup(const CompilerInvocation &Invok) {
     Invocation.getLangOptions().AttachCommentsToDecls = true;
   }
 
-  // Set up the type checker options.
-  auto &typeCkOpts = Invocation.getTypeCheckerOptions();
-  if (isWholeModuleCompilation()) {
-    typeCkOpts.DelayWholeModuleChecking = true;
-  }
-  if (FrontendOptions::isActionImmediate(frontendOpts.RequestedAction)) {
-    typeCkOpts.InImmediateMode = true;
-  }
-
   assert(Lexer::isIdentifier(Invocation.getModuleName()));
 
   if (isInSILMode())