Export sanitizer vars for use in Bazel

Bug: 265154269
Test: Unit tests
Change-Id: I46584159264476d76079e396c6ec294fb394acff
diff --git a/bp2build/conversion_test.go b/bp2build/conversion_test.go
index 43daddc..b9c06bc 100644
--- a/bp2build/conversion_test.go
+++ b/bp2build/conversion_test.go
@@ -101,7 +101,11 @@
 		},
 		{
 			dir:      "cc_toolchain",
-			basename: "constants.bzl",
+			basename: "config_constants.bzl",
+		},
+		{
+			dir:      "cc_toolchain",
+			basename: "sanitizer_constants.bzl",
 		},
 		{
 			dir:      "java_toolchain",