Convert from String to Supplier<Type> only once per string

Iterables.transform is fairly expensive if you're going to iterate over the
result more than once, because it performs the transformation each time.

The speedup from this is pretty insignificant, but it's not nothing.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=259012455

check_api/src/main/java/com/google/errorprone/predicates/TypePredicates.java

@@ -16,8 +16,8 @@
 
 package com.google.errorprone.predicates;
 
-import com.google.common.base.Function;
-import com.google.common.collect.Iterables;
+import static com.google.errorprone.suppliers.Suppliers.fromStrings;
+
 import com.google.errorprone.predicates.type.Any;
 import com.google.errorprone.predicates.type.Array;
 import com.google.errorprone.predicates.type.DescendantOf;
@@ -51,17 +51,9 @@ public static TypePredicate isExactType(Supplier<Type> type) {
     return new Exact(type);
   }
 
-  private static final Function<String, Supplier<Type>> GET_TYPE =
-      new Function<String, Supplier<Type>>() {
-        @Override
-        public Supplier<Type> apply(String input) {
-          return Suppliers.typeFromString(input);
-        }
-      };
-
   /** Match types that are exactly equal to any of the given types. */
   public static TypePredicate isExactTypeAny(Iterable<String> types) {
-    return new ExactAny(Iterables.transform(types, GET_TYPE));
+    return new ExactAny(fromStrings(types));
   }
 
   /** Match sub-types of the given type. */
@@ -71,7 +63,7 @@ public static TypePredicate isDescendantOf(Supplier<Type> type) {
 
   /** Match types that are a sub-type of one of the given types. */
   public static TypePredicate isDescendantOfAny(Iterable<String> types) {
-    return new DescendantOfAny(Iterables.transform(types, GET_TYPE));
+    return new DescendantOfAny(fromStrings(types));
   }
 
   /** Match sub-types of the given type. */