Migrate ObjcProvider's direct headers usage to CcInfo

The direct_headers field in ObjcProvider is being deprecated and will
be removed.  The same information can be found in CcInfo.
J2ObjcAspect has been modified so that the CcInfo is accessible via
Starlark.

PiperOrigin-RevId: 417648590
(cherry picked from commit 612725e)

swift/internal/swift_clang_module_aspect.bzl

@@ -375,10 +375,7 @@ def _j2objc_compilation_context(target):
     which is tied to Bazel's built-in module map generation. Since there's not a
     direct umbrella header field in `ObjcProvider`, we scan the target's actions
     to find the one that writes it out. Then, we return it and a new compilation
-    context with the direct headers from the `ObjcProvider`, since the generated
-    headers are not accessible via `CcInfo`--Java targets to which the J2ObjC
-    aspect are applied do not propagate `CcInfo` directly, but a native Bazel
-    provider that wraps the `CcInfo`, and we have no access to it from Starlark.
+    context with the direct headers from the `CcInfo` of the J2ObjC aspect.
 
     Args:
         target: The target to which the aspect is being applied.
@@ -393,35 +390,38 @@ def _j2objc_compilation_context(target):
             continue
 
         umbrella_header = action.outputs.to_list()[0]
+        headers = target[CcInfo].compilation_context.direct_headers
 
         if JavaInfo not in target:
             # This is not a `java_library`, but a `proto_library` processed by J2ObjC. We need to
             # treat the generated headers as textual, but do not need the special header search path
             # logic like we do for `java_library` targets below.
             return cc_common.create_compilation_context(
                 headers = depset([umbrella_header]),
-                direct_textual_headers = target[apple_common.Objc].direct_headers,
+                direct_textual_headers = headers,
             )
 
-        # Use the path of the first generated header to determine the base directory that
-        # J2ObjC wrote its generated header files to.
-        header_path = target[apple_common.Objc].direct_headers[0].path
+        include_paths = sets.make()
+        for header in headers:
+            header_path = header.path
 
-        if "/_j2objc/src_jar_files/" in header_path:
-            # When source jars are used the headers are generated within a tree artifact.
-            # We can use the path to the tree artifact as the include search path.
-            include_path = header_path
-        else:
-            # J2ObjC generates headers within <bin_dir>/<package>/_j2objc/<target>/.
-            # Compute that path to use as the include search path.
-            header_path_components = header_path.split("/")
-            j2objc_index = header_path_components.index("_j2objc")
-            include_path = "/".join(header_path_components[:j2objc_index + 2])
+            if "/_j2objc/src_jar_files/" in header_path:
+                # When source jars are used the headers are generated within a tree artifact.
+                # We can use the path to the tree artifact as the include search path.
+                include_path = header_path
+            else:
+                # J2ObjC generates headers within <bin_dir>/<package>/_j2objc/<target>/.
+                # Compute that path to use as the include search path.
+                header_path_components = header_path.split("/")
+                j2objc_index = header_path_components.index("_j2objc")
+                include_path = "/".join(header_path_components[:j2objc_index + 2])
+
+            sets.insert(include_paths, include_path)
 
         return cc_common.create_compilation_context(
             headers = depset([umbrella_header]),
-            direct_textual_headers = target[apple_common.Objc].direct_headers,
-            includes = depset([include_path]),
+            direct_textual_headers = headers,
+            includes = depset(sets.to_list(include_paths)),
         )
 
     return None