Revert "Use InitLLVM to setup a pretty stack printer"

This reverts commit 3f76260dc0674cc0acb25f550a0f0c594cf537ea.
Breaks at least these tests on Windows:
    Clang :: Driver/clang-offload-bundler.c
    Clang :: Driver/clang-offload-wrapper.c
diff --git a/clang/utils/TableGen/TableGen.cpp b/clang/utils/TableGen/TableGen.cpp
index 3b9c833..c988a58 100644
--- a/clang/utils/TableGen/TableGen.cpp
+++ b/clang/utils/TableGen/TableGen.cpp
@@ -10,10 +10,9 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "ClangASTEmitters.h"
 #include "TableGenBackends.h" // Declares all backends.
+#include "ClangASTEmitters.h"
 #include "llvm/Support/CommandLine.h"
-#include "llvm/Support/InitLLVM.h"
 #include "llvm/Support/PrettyStackTrace.h"
 #include "llvm/Support/Signals.h"
 #include "llvm/TableGen/Error.h"
@@ -350,7 +349,8 @@
 }
 
 int main(int argc, char **argv) {
-  llvm::InitLLVM X(argc, argv);
+  sys::PrintStackTraceOnErrorSignal(argv[0]);
+  PrettyStackTraceProgram X(argc, argv);
   cl::ParseCommandLineOptions(argc, argv);
 
   llvm_shutdown_obj Y;