chore: ignore unstable coverage

lib/Compilation.js

@@ -2578,6 +2578,8 @@ BREAKING CHANGE: Asset processing hooks in Compilation has been merged into a si
 			p.calculate();
 
 			const logger = this.getLogger("webpack.Compilation.ModuleProfile");
+			// Avoid coverage problems due indirect changes
+			/* istanbul ignore next */
 			const logByValue = (value, msg) => {
 				if (value > 1000) {
 					logger.error(msg);

lib/cache/MemoryWithGcCachePlugin.js

@@ -34,6 +34,8 @@ class MemoryWithGcCachePlugin {
 			generation++;
 			let clearedEntries = 0;
 			let lastClearedIdentifier;
+			// Avoid coverage problems due indirect changes
+			/* istanbul ignore next */
 			for (const [identifier, entry] of oldCache) {
 				if (entry.until > generation) break;