Change Starlark builtin helper methods

Done to facilitate rewrite of other native rules.

RELNOTES:none
PiperOrigin-RevId: 483619584
Change-Id: Id36af65150d81723785e8f6a877fbd7a6f612697

src/main/starlark/builtins_bzl/common/cc/cc_helper.bzl

@@ -881,7 +881,9 @@ def _expand_make_variables_for_copts(ctx, tokenization, unexpanded_tokens, addit
 def _get_copts(ctx, common, feature_configuration, additional_make_variable_substitutions):
     if not hasattr(ctx.attr, "copts"):
         fail("could not find rule attribute named: 'copts'")
-    package_copts = common.unexpanded_package_copts
+    package_copts = []
+    if common:
+        package_copts = common.unexpanded_package_copts
     attribute_copts = ctx.attr.copts
     tokenization = not (cc_common.is_enabled(feature_configuration = feature_configuration, feature_name = "no_copts_tokenization") or "no_copts_tokenization" in ctx.features)
     expanded_package_copts = _expand_make_variables_for_copts(ctx, tokenization, package_copts, additional_make_variable_substitutions)

src/main/starlark/builtins_bzl/common/java/java_common.bzl

@@ -133,10 +133,10 @@ def basic_java_library(
         ctx.outputs.sourcejar,
         source_files,
         source_jars,
-        _collect_deps(deps + [coverage_config.runner]) if coverage_config and coverage_config.runner else _collect_deps(deps),
-        _collect_deps(runtime_deps),
+        collect_deps(deps + [coverage_config.runner]) if coverage_config and coverage_config.runner else collect_deps(deps),
+        collect_deps(runtime_deps),
         plugins_javaplugininfo,
-        _collect_deps(exports),
+        collect_deps(exports),
         _collect_plugins(exported_plugins),
         resources,
         resource_jars,
@@ -208,7 +208,7 @@ def _collect_plugins(plugins):
     """
     return _filter_provider(JavaPluginInfo, plugins)
 
-def _collect_deps(deps):
+def collect_deps(deps):
     """Collects dependencies from an attribute.
 
     Use this call to collect plugins from `deps`, `runtime_deps`, or `exports` attribute.