[vm] Fix one MSAN failure; add UBSAN configuration.

Change-Id: I5b1d43836f3eb09983195fc3792f369aa3f8079f
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/120750
Reviewed-by: Chinmay Garde <chinmaygarde@google.com>
Commit-Queue: Ryan Macnak <rmacnak@google.com>
diff --git a/runtime/vm/compiler/backend/bce_test.cc b/runtime/vm/compiler/backend/bce_test.cc
index d7f508c..2bef2ba 100644
--- a/runtime/vm/compiler/backend/bce_test.cc
+++ b/runtime/vm/compiler/backend/bce_test.cc
@@ -67,8 +67,8 @@
                           intptr_t expected_before,
                           intptr_t expected_after) {
   auto jit_result = ApplyBCE(script_chars, CompilerPass::kJIT);
-  EXPECT_STREQ(expected_before, jit_result.first);
-  EXPECT_STREQ(expected_after, jit_result.second);
+  EXPECT_EQ(expected_before, jit_result.first);
+  EXPECT_EQ(expected_after, jit_result.second);
 }
 
 //