Bump open source LLVM revision to 387c3f74fd8efdc0be464b0e1a8033cc1eeb739c.

PiperOrigin-RevId: 297470700
Change-Id: Ib416577ec8501a7dfb7ba364914fff5654e09d9b
diff --git a/tensorflow/workspace.bzl b/tensorflow/workspace.bzl
index 897e553..5fb558b 100755
--- a/tensorflow/workspace.bzl
+++ b/tensorflow/workspace.bzl
@@ -597,8 +597,8 @@
     )
 
     # Check out LLVM and MLIR from llvm-project.
-    LLVM_COMMIT = "fee41517fe0f7ff9f0e204dd9200ebf32ca03cb8"
-    LLVM_SHA256 = "dceb84396e8c30348dbd426c53eeae6657f5c67a24830c9a610a037fffcbe5cf"
+    LLVM_COMMIT = "387c3f74fd8efdc0be464b0e1a8033cc1eeb739c"
+    LLVM_SHA256 = "5648d1bdd933f45aa6556cf104b32a0418121ce6961f5f47e8ef5bc6e428434f"
     LLVM_URLS = [
         "https://storage.googleapis.com/mirror.tensorflow.org/github.com/llvm/llvm-project/archive/{commit}.tar.gz".format(commit = LLVM_COMMIT),
         "https://github.com/llvm/llvm-project/archive/{commit}.tar.gz".format(commit = LLVM_COMMIT),