Reapply fast-URI patch.

pkg/analyzer/lib/src/util/fast_uri.dart

Index: pkg/analyzer/lib/src/util/fast_uri.dart
diff --git a/pkg/analyzer/lib/src/util/fast_uri.dart b/pkg/analyzer/lib/src/util/fast_uri.dart
index 8af548c82640e91fc126f9b29fcc099891cb9211..0df5ce05ae85257bbf96471396802c7723685194 100644
--- a/pkg/analyzer/lib/src/util/fast_uri.dart
+++ b/pkg/analyzer/lib/src/util/fast_uri.dart
@@ -62,23 +62,7 @@ class FastUri implements Uri {
   bool get hasFragment => false;
 
   @override
-  int get hashCode {
-    // This code is copied from the standard Uri implementation.
-    // It is important that Uri and FastUri generate compatible hashCodes
-    // because Uri and FastUri may be used as keys in the same map.
-    int combine(part, current) {
-      // The sum is truncated to 30 bits to make sure it fits into a Smi.
-      return (current * 31 + part.hashCode) & 0x3FFFFFFF;
-    }
-    return _hashCode ??= combine(
-        scheme,
-        combine(
-            userInfo,
-            combine(
-                host,
-                combine(port,
-                    combine(path, combine(query, combine(fragment, 1)))))));
-  }
+  int get hashCode => _text.hashCode;
 
   @override
   bool get hasPort => false;