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

This would be useful if downstream projects want to use the provided
pretty printers

Author: hashemthomas1

utils/bazel/llvm-project-overlay/llvm/BUILD.bazel

@@ -5160,6 +5160,11 @@ cc_binary(
     ],
 )
 
+filegroup(
+    name = "gdb-scripts",
+    srcs = glob(["utils/gdb-scripts/*"]),
+)
+
 ################################################################################
 # Begin testonly libraries
 

utils/bazel/llvm-project-overlay/mlir/BUILD.bazel

@@ -30,6 +30,11 @@ exports_files([
     "utils/textmate/mlir.json",
 ])
 
+filegroup(
+    name = "gdb-scripts",
+    srcs = glob(["utils/gdb-scripts/*"]),
+)
+
 bool_flag(
     name = "enable_cuda",
     build_setting_default = False,