[llvm] Revert "Add HexagonGlobalScheduler pass (#180803)" (PR #181418)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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``````````bash
git-clang-format --diff origin/main HEAD --extensions h,cpp -- llvm/lib/Target/Hexagon/Hexagon.h llvm/lib/Target/Hexagon/HexagonRegisterInfo.cpp llvm/lib/Target/Hexagon/HexagonRegisterInfo.h llvm/lib/Target/Hexagon/HexagonTargetMachine.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Target/Hexagon/HexagonRegisterInfo.cpp b/llvm/lib/Target/Hexagon/HexagonRegisterInfo.cpp
index 77ce983d2..0a18ed8b3 100644
--- a/llvm/lib/Target/Hexagon/HexagonRegisterInfo.cpp
+++ b/llvm/lib/Target/Hexagon/HexagonRegisterInfo.cpp
@@ -52,7 +52,6 @@ HexagonRegisterInfo::HexagonRegisterInfo(unsigned HwMode)
     : HexagonGenRegisterInfo(Hexagon::R31, 0/*DwarfFlavor*/, 0/*EHFlavor*/,
                              0/*PC*/, HwMode) {}
 
-
 bool HexagonRegisterInfo::isEHReturnCalleeSaveReg(Register R) const {
   return R == Hexagon::R0 || R == Hexagon::R1 || R == Hexagon::R2 ||
          R == Hexagon::R3 || R == Hexagon::D0 || R == Hexagon::D1;

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https://github.com/llvm/llvm-project/pull/181418