Turn a few DCHECK into CHECKs.

To help diagnose b/63070152.

bug: 63070152
Test: test.py
Change-Id: I1ac1cf9bfe1bc15ecfa94b5b8537cd3afda6fd14
diff --git a/compiler/optimizing/ssa_liveness_analysis.cc b/compiler/optimizing/ssa_liveness_analysis.cc
index 7b7495b..185303b 100644
--- a/compiler/optimizing/ssa_liveness_analysis.cc
+++ b/compiler/optimizing/ssa_liveness_analysis.cc
@@ -197,7 +197,7 @@
           HInstruction* instruction = environment->GetInstructionAt(i);
           bool should_be_live = ShouldBeLiveForEnvironment(current, instruction);
           if (should_be_live) {
-            DCHECK(instruction->HasSsaIndex());
+            CHECK(instruction->HasSsaIndex()) << instruction->DebugName();
             live_in->SetBit(instruction->GetSsaIndex());
           }
           if (instruction != nullptr) {