update llvm toolchain repo

Change-Id: I033a4b201c72fe43e70702eed3c4098666398c1d

WORKSPACE.bazel

@@ -98,13 +98,13 @@ bootlin_toolchain(
     libc_impl = "glibc",
 )
 
-BAZEL_TOOLCHAIN_VERSION = "ade23e0e37c5308162c012a4f4224459c1c4fa22"
+TOOLCHAINS_LLVM_VERSION = "bba94f8138ab454d70afcd263788b34e2801e2ba"
 
 http_archive(
-    name = "bazel_toolchain",
-    sha256 = "968e507ce913b93971aeb77b4b0a96f7b59b1f51cbaae57aefef4c573776ed56",
-    strip_prefix = "bazel-toolchain-%s" % BAZEL_TOOLCHAIN_VERSION,
-    url = "https://github.com/grailbio/bazel-toolchain/archive/%s.tar.gz" % BAZEL_TOOLCHAIN_VERSION,
+    name = "toolchains_llvm",
+    integrity = "sha256-IyBbm0rakJat7jSGvZ65xVGS2xQQhbXvmx8Q5EA5wlA=",
+    strip_prefix = "toolchains_llvm-%s" % TOOLCHAINS_LLVM_VERSION,
+    url = "https://github.com/bazel-contrib/toolchains_llvm/archive/%s.tar.gz" % TOOLCHAINS_LLVM_VERSION,
 )
 
 load("//tools:llvm_toolchain_dependencies.bzl", "llvm_toolchain_dependencies")

tools/llvm_toolchain.bzl

@@ -4,11 +4,11 @@ instead of the system installed libraries.
 """
 
 load(
-    "@bazel_toolchain//toolchain:deps.bzl",
+    "@toolchains_llvm//toolchain:deps.bzl",
     _llvm_toolchain_dependencies = "bazel_toolchain_dependencies",
 )
 load(
-    "@bazel_toolchain//toolchain:rules.bzl",
+    "@toolchains_llvm//toolchain:rules.bzl",
     _llvm_toolchain = "llvm_toolchain",
     _llvm_toolchain_files = "llvm",
 )

tools/llvm_toolchain_dependencies.bzl

@@ -3,7 +3,7 @@ Provides a wrapper around `bazel_toolchain_dependencies` which also obtains the
 abspath to Bazel's external directory for use by the `llvm_toolchain` wrapper.
 """
 
-load("@bazel_toolchain//toolchain:deps.bzl", "bazel_toolchain_dependencies")
+load("@toolchains_llvm//toolchain:deps.bzl", "bazel_toolchain_dependencies")
 load("//tools:local_config_info.bzl", "local_config_info")
 
 #  Rename to (hopefully) be less confusing