[Dependency Scanning] Have the scanner cache answer queries relevant to current search paths only.

The dependency scanner's cache persists across different queries and answering a subsequent query's module lookup with a module not in the query's search path is not correct.

For example, suppose we are looking for a Swift module `Foo` with a set of search paths `SP`.
And dependency scanner cache already contains a module `Foo`, for which we found an interface file at location `L`. If `L`∉`SP`, then we cannot re-use the cached entry because we’d be resolving the scanning query to a filesystem location that the current scanning context is not aware of.

Resolves rdar://81175942

lib/Serialization/SerializedModuleLoader.cpp

@@ -88,18 +88,10 @@ Optional<bool> forEachModuleSearchPath(
   // Apple platforms have extra implicit framework search paths:
   // $SDKROOT/System/Library/Frameworks/ and $SDKROOT/Library/Frameworks/.
   if (Ctx.LangOpts.Target.isOSDarwin()) {
-    SmallString<128> scratch;
-    scratch = Ctx.SearchPathOpts.SDKPath;
-    llvm::sys::path::append(scratch, "System", "Library", "Frameworks");
-    if (auto result =
-            callback(scratch, SearchPathKind::Framework, /*isSystem=*/true))
-      return result;
-
-    scratch = Ctx.SearchPathOpts.SDKPath;
-    llvm::sys::path::append(scratch, "Library", "Frameworks");
-    if (auto result =
-            callback(scratch, SearchPathKind::Framework, /*isSystem=*/true))
-      return result;
+    for (const auto &path : Ctx.getDarwinImplicitFrameworkSearchPaths())
+      if (auto result =
+          callback(path, SearchPathKind::Framework, /*isSystem=*/true))
+        return result;
   }
 
   for (auto importPath : Ctx.SearchPathOpts.RuntimeLibraryImportPaths) {