Automated rollback of commit f4b35a2df7f4e0fccec93c901a7ffc3ce96e17e6.

*** Reason for rollback ***

This change was originally made to try to fix failing presubmits related to ImpossibleNullComparison. But this was instead fixed by cherry-picking https://github.com/bazelbuild/bazel/commit/83d0f2cafaac42e3b2b1822340f8f813ad4698e5 into the 6.3 branch. This change has been reverted to avoid disabling too many checks.

*** Original change description ***

Disable ImpossibleNullComparison

PiperOrigin-RevId: 532817246
Change-Id: Ib617ddb2e55159a7de84f9c6f483b8d992166a3a
diff --git a/tools/jdk/default_java_toolchain.bzl b/tools/jdk/default_java_toolchain.bzl
index 47384c2..a83e14e 100644
--- a/tools/jdk/default_java_toolchain.bzl
+++ b/tools/jdk/default_java_toolchain.bzl
@@ -62,7 +62,6 @@
     "-Xep:EmptyTopLevelDeclaration:OFF",
     "-Xep:LenientFormatStringValidation:OFF",
     "-Xep:ReturnMissingNullable:OFF",
-    "-Xep:ImpossibleNullComparison:OFF",
 ]
 
 # Default java_toolchain parameters