[MTE] test for exception cleanup.

This depends on the LLVM change https://reviews.llvm.org/D135639.

Test: adb shell /data/local/tmp/stack_tagging_helper exception_cleanup
Bug: 174878242
Change-Id: Ia1dfdbe482b40c174acaf6c1ac4ad054470d10b8
diff --git a/tests/libs/Android.bp b/tests/libs/Android.bp
index 0c9a2e0..8ae2257 100644
--- a/tests/libs/Android.bp
+++ b/tests/libs/Android.bp
@@ -1661,6 +1661,7 @@
      },
    },
    header_libs: ["bionic_libc_platform_headers"],
+   cflags: ["-fexceptions"],
 }
 
 cc_test {
@@ -1676,6 +1677,7 @@
      },
    },
    header_libs: ["bionic_libc_platform_headers"],
+   cflags: ["-fexceptions"],
 }
 
 cc_genrule {