Remove nearly-unused ASTNode description code.

The entire ASTNode is probably going away soon, but this is a decent
place to start. Checking the fuzzer logs, we had 0% coverage in here,
which makes sense because it's unreachable by any normal means.

Change-Id: I396464e3e613d46e990b629c4fc991c11f6110fa
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/442000
Commit-Queue: John Stiles <johnstiles@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
diff --git a/src/sksl/SkSLIRGenerator.cpp b/src/sksl/SkSLIRGenerator.cpp
index e7a5dd9..6f05897 100644
--- a/src/sksl/SkSLIRGenerator.cpp
+++ b/src/sksl/SkSLIRGenerator.cpp
@@ -1159,7 +1159,7 @@
         case ASTNode::Kind::kTernary:
             return this->convertTernaryExpression(expr);
         default:
-            SkDEBUGFAILF("unsupported expression: %s\n", expr.description().c_str());
+            SkDEBUGFAIL("unsupported expression");
             return nullptr;
     }
 }
@@ -1746,7 +1746,7 @@
                     break;
                 }
                 default:
-                    SkDEBUGFAILF("unsupported declaration: %s\n", decl.description().c_str());
+                    SkDEBUGFAIL("unsupported declaration");
                     break;
             }
         }