Remove a workaround that no longer applies since Bazel's DottedVersion comparison has been fixed.

RELNOTES: None.
PiperOrigin-RevId: 274033010

Author: allevato

swift/internal/xcode_swift_toolchain.bzl

@@ -248,21 +248,6 @@ def _is_macos(platform):
     """
     return platform.platform_type == apple_common.platform_type.macos
 
-def _trim_version(version):
-    """Trim the given version number down to a maximum of three components.
-
-    Args:
-        version: The version number to trim; either a string or a
-        `DottedVersion` value.
-
-    Returns:
-        The trimmed version number as a `DottedVersion` value.
-    """
-    version = str(version)
-    parts = version.split(".")
-    maxparts = min(len(parts), 3)
-    return apple_common.dotted_version(".".join(parts[:maxparts]))
-
 def _is_xcode_at_least_version(xcode_config, desired_version):
     """Returns True if we are building with at least the given Xcode version.
 
@@ -281,10 +266,8 @@ def _is_xcode_at_least_version(xcode_config, desired_version):
              "Xcode isn't available; if you think this is a mistake, please " +
              "file an issue.")
 
-    # TODO(b/131195460): DottedVersion comparison is broken for four-component
-    # versions that are returned by modern Xcodes. Work around it for now.
-    desired_version_value = _trim_version(desired_version)
-    return _trim_version(current_version) >= desired_version_value
+    desired_version_value = apple_common.dotted_version(desired_version)
+    return current_version >= desired_version_value
 
 def _swift_apple_target_triple(cpu, platform, version):
     """Returns a target triple string for an Apple platform.