Fix --experimental_prefer_mutual_xcode=false to recognize the correct developer directory for local xcode version tools when a mutually available Xcode is selected.

The change in https://github.com/bazelbuild/bazel/commit/2572bba43133692b249eb840d5262cb32bc020db started using the version number of the default local version to find the local xcode, but this results in looking for developer tools at a path that doesn't exist. Instead, use the remote version associated with that local version, and match on that one, as we do with --experimental_prefer_mutual_xcode=true.

RELNOTES: None.
PiperOrigin-RevId: 295961075

src/main/java/com/google/devtools/build/lib/rules/apple/XcodeConfig.java

diff --git a/src/main/java/com/google/devtools/build/lib/rules/apple/XcodeConfig.java b/src/main/java/com/google/devtools/build/lib/rules/apple/XcodeConfig.java
index 06396be..5814866 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/apple/XcodeConfig.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/apple/XcodeConfig.java
@@ -343,6 +343,7 @@
     }
     // Select the local default.
     Availability availability = null;
+    XcodeVersionRuleData localVersion = null;
     if (mutuallyAvailableVersions.isEmpty()) {
       ruleContext.ruleWarning(
           String.format(
@@ -352,18 +353,22 @@
                   + " performance.",
               localVersions.getDefaultVersion().getVersion(),
               printableXcodeVersions(remoteVersions.getAvailableVersions())));
+      localVersion = localVersions.getDefaultVersion();
       availability = Availability.LOCAL;
     } else if (remoteAliasesToVersionMap.containsKey(
         localVersions.getDefaultVersion().getVersion().toString())) {
       availability = Availability.BOTH;
+      localVersion =
+          remoteAliasesToVersionMap.get(localVersions.getDefaultVersion().getVersion().toString());
     } else {
       ruleContext.ruleWarning(
           "You passed --experimental_prefer_mutual_xcode=false, which prevents Bazel from"
               + " selecting an Xcode version that optimizes your performance. Please consider"
               + " using --experimental_prefer_mutual_xcode=true.");
       availability = Availability.LOCAL;
+      localVersion = localVersions.getDefaultVersion();
     }
-    return Maps.immutableEntry(localVersions.getDefaultVersion(), availability);
+    return Maps.immutableEntry(localVersion, availability);
   }
 
   private static String printableXcodeVersions(Iterable<XcodeVersionRuleData> xcodeVersions) {