[llvm] [llc] Move LLVMLlcDriver implementation into lib (PR #222840)

[Nico Weber via llvm-commits]

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@@ -20,9 +20,9 @@ executable("llc") {
     "//llvm/lib/Transforms/Vectorize",
   ]
   sources = [
-    "NewPMDriver.cpp",
+    "lib/NewPMDriver.cpp",
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nico wrote:

(fyi no need to change gn or bazel files; others will do that)

https://github.com/llvm/llvm-project/pull/222840