[bazel] Add gdb-scripts filegroup in llvm and mlir (#146358)

This would be useful if downstream projects want to use the provided
pretty printers
diff --git a/utils/bazel/llvm-project-overlay/llvm/BUILD.bazel b/utils/bazel/llvm-project-overlay/llvm/BUILD.bazel
index c9fbd10..1fd9fde 100644
--- a/utils/bazel/llvm-project-overlay/llvm/BUILD.bazel
+++ b/utils/bazel/llvm-project-overlay/llvm/BUILD.bazel
@@ -5160,6 +5160,11 @@
     ],
 )
 
+filegroup(
+    name = "gdb-scripts",
+    srcs = glob(["utils/gdb-scripts/*"]),
+)
+
 ################################################################################
 # Begin testonly libraries
 
diff --git a/utils/bazel/llvm-project-overlay/mlir/BUILD.bazel b/utils/bazel/llvm-project-overlay/mlir/BUILD.bazel
index 5320dc32..7e4607f 100644
--- a/utils/bazel/llvm-project-overlay/mlir/BUILD.bazel
+++ b/utils/bazel/llvm-project-overlay/mlir/BUILD.bazel
@@ -30,6 +30,11 @@
     "utils/textmate/mlir.json",
 ])
 
+filegroup(
+    name = "gdb-scripts",
+    srcs = glob(["utils/gdb-scripts/*"]),
+)
+
 bool_flag(
     name = "enable_cuda",
     build_setting_default = False,