[Bazel] Fix llvm-exegesis build post 12b0ab2

12b0ab2 switched llvm-exegesis from using MCJIT to OrcJIT, which is a
different dep/library. This was ported over in the CMake build, but not
in the bazel build. This patch adjusts the llvm-exegesis deps in the
Bazel build to account for this change.

Author: boomanaiden154

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

@@ -3117,7 +3117,7 @@ cc_library(
         ":MC",
         ":MCA",
         ":MCDisassembler",
-        ":MCJIT",
+        ":OrcJIT",
         ":Object",
         ":ObjectYAML",
         ":Support",