[embedded] Require SwiftCompilerSources to use embedded Swift

Author: kubamracek

include/swift/SIL/SILBridging.h

@@ -60,6 +60,7 @@ class SwiftPassInvocation;
 class GenericSpecializationInformation;
 }
 
+extern bool nodeMetatypesInitialized;
 void registerBridgedClass(BridgedStringRef className, SwiftMetatype metatype);
 
 struct BridgedType {

lib/Frontend/CompilerInvocation.cpp

@@ -20,6 +20,7 @@
 #include "swift/Option/Options.h"
 #include "swift/Option/SanitizerOptions.h"
 #include "swift/Parse/ParseVersion.h"
+#include "swift/SIL/SILBridging.h"
 #include "swift/Strings.h"
 #include "swift/SymbolGraphGen/SymbolGraphOptions.h"
 #include "llvm/ADT/STLExtras.h"
@@ -1334,6 +1335,8 @@ static bool ParseLangArgs(LangOptions &Opts, ArgList &Args,
   Opts.BypassResilienceChecks |= Args.hasArg(OPT_bypass_resilience);
 
   if (Opts.hasFeature(Feature::Embedded)) {
+    assert(nodeMetatypesInitialized && "no SwiftCompilerSources");
+
     Opts.UnavailableDeclOptimizationMode = UnavailableDeclOptimization::Complete;
     Opts.DisableImplicitStringProcessingModuleImport = true;
     Opts.DisableImplicitConcurrencyModuleImport = true;

lib/SIL/Utils/SILBridging.cpp

@@ -31,10 +31,10 @@
 
 using namespace swift;
 
-namespace {
-
 bool nodeMetatypesInitialized = false;
 
+namespace {
+
 // Filled in by class registration in initializeSwiftModules().
 SwiftMetatype nodeMetatypes[(unsigned)SILNodeKind::Last_SILNode + 1];