Add CcUnstrippedInfo provider and use it in mixed builds

The build uses unstripped binary/shared library to extract function
signatures, so for each each target of this kind Bazel should return
its unstripped version, too.

Fixes: 220164721
Test: treehugger

Change-Id: Id5f6143340519bf2ae98791a9e981d1306bb08d1
diff --git a/cc/library_test.go b/cc/library_test.go
index 6d5eda2..2bc9967 100644
--- a/cc/library_test.go
+++ b/cc/library_test.go
@@ -259,6 +259,7 @@
 				SystemIncludes:       []string{"system_include"},
 				Headers:              []string{"foo.h"},
 				RootDynamicLibraries: []string{"foo.so"},
+				UnstrippedOutput:     "foo_unstripped.so",
 			},
 			"//foo/bar:bar_bp2build_cc_library_static": cquery.CcInfo{
 				CcObjectFiles:      []string{"foo.o"},
@@ -294,6 +295,7 @@
 	expectedOutputFiles = []string{"outputbase/execroot/__main__/foo.so"}
 	android.AssertDeepEquals(t, "output files", expectedOutputFiles, outputFiles.Strings())
 
+	android.AssertStringEquals(t, "unstripped shared library", "outputbase/execroot/__main__/foo_unstripped.so", sharedFoo.(*Module).linker.unstrippedOutputFilePath().String())
 	flagExporter = ctx.ModuleProvider(sharedFoo, FlagExporterInfoProvider).(FlagExporterInfo)
 	android.AssertPathsRelativeToTopEquals(t, "exported include dirs", []string{"outputbase/execroot/__main__/include"}, flagExporter.IncludeDirs)
 	android.AssertPathsRelativeToTopEquals(t, "exported system include dirs", []string{"outputbase/execroot/__main__/system_include"}, flagExporter.SystemIncludeDirs)