Revert "[clang] Add managarm support" (#144514)

Reverts #139271

There are multiple failing build bots:
https://lab.llvm.org/buildbot/#/builders/10/builds/7482
https://lab.llvm.org/buildbot/#/builders/11/builds/17473

Author: AaronBallman

clang/lib/Basic/Targets.cpp

@@ -164,9 +164,6 @@ std::unique_ptr<TargetInfo> AllocateTarget(const llvm::Triple &Triple,
         return std::make_unique<OHOSTargetInfo<AArch64leTargetInfo>>(Triple,
                                                                      Opts);
       }
-    case llvm::Triple::Managarm:
-      return std::make_unique<ManagarmTargetInfo<AArch64leTargetInfo>>(Triple,
-                                                                       Opts);
     case llvm::Triple::NetBSD:
       return std::make_unique<NetBSDTargetInfo<AArch64leTargetInfo>>(Triple,
                                                                      Opts);
@@ -469,9 +466,6 @@ std::unique_ptr<TargetInfo> AllocateTarget(const llvm::Triple &Triple,
         return std::make_unique<OHOSTargetInfo<RISCV64TargetInfo>>(Triple,
                                                                    Opts);
       }
-    case llvm::Triple::Managarm:
-      return std::make_unique<ManagarmTargetInfo<RISCV64TargetInfo>>(Triple,
-                                                                     Opts);
     default:
       return std::make_unique<RISCV64TargetInfo>(Triple, Opts);
     }
@@ -660,9 +654,6 @@ std::unique_ptr<TargetInfo> AllocateTarget(const llvm::Triple &Triple,
       return std::make_unique<PS5OSTargetInfo<X86_64TargetInfo>>(Triple, Opts);
     case llvm::Triple::Hurd:
       return std::make_unique<HurdTargetInfo<X86_64TargetInfo>>(Triple, Opts);
-    case llvm::Triple::Managarm:
-      return std::make_unique<ManagarmTargetInfo<X86_64TargetInfo>>(Triple,
-                                                                    Opts);
     default:
       return std::make_unique<X86_64TargetInfo>(Triple, Opts);
     }

clang/lib/Basic/Targets/OSTargets.h

@@ -395,36 +395,6 @@ class LLVM_LIBRARY_VISIBILITY LinuxTargetInfo : public OSTargetInfo<Target> {
   }
 };
 
-// Managarm Target
-template <typename Target>
-class LLVM_LIBRARY_VISIBILITY ManagarmTargetInfo : public OSTargetInfo<Target> {
-protected:
-  void getOSDefines(const LangOptions &Opts, const llvm::Triple &Triple,
-                    MacroBuilder &Builder) const override {
-    DefineStd(Builder, "unix", Opts);
-    Builder.defineMacro("__managarm__");
-    if (Opts.POSIXThreads)
-      Builder.defineMacro("_REENTRANT");
-    if (Opts.CPlusPlus)
-      Builder.defineMacro("_GNU_SOURCE");
-    if (this->HasFloat128)
-      Builder.defineMacro("__FLOAT128__");
-  }
-
-public:
-  ManagarmTargetInfo(const llvm::Triple &Triple, const TargetOptions &Opts)
-      : OSTargetInfo<Target>(Triple, Opts) {
-    switch (Triple.getArch()) {
-    default:
-      break;
-    case llvm::Triple::x86:
-    case llvm::Triple::x86_64:
-      this->HasFloat128 = true;
-      break;
-    }
-  }
-};
-
 // NetBSD Target
 template <typename Target>
 class LLVM_LIBRARY_VISIBILITY NetBSDTargetInfo : public OSTargetInfo<Target> {

clang/lib/Driver/CMakeLists.txt

@@ -66,7 +66,6 @@ add_clang_library(clangDriver
   ToolChains/HLSL.cpp
   ToolChains/Hurd.cpp
   ToolChains/Linux.cpp
-  ToolChains/Managarm.cpp
   ToolChains/MipsLinux.cpp
   ToolChains/MinGW.cpp
   ToolChains/MSP430.cpp

clang/lib/Driver/Driver.cpp

@@ -33,7 +33,6 @@
 #include "ToolChains/Linux.h"
 #include "ToolChains/MSP430.h"
 #include "ToolChains/MSVC.h"
-#include "ToolChains/Managarm.h"
 #include "ToolChains/MinGW.h"
 #include "ToolChains/MipsLinux.h"
 #include "ToolChains/NaCl.h"
@@ -6851,9 +6850,6 @@ const ToolChain &Driver::getToolChain(const ArgList &Args,
     case llvm::Triple::Fuchsia:
       TC = std::make_unique<toolchains::Fuchsia>(*this, Target, Args);
       break;
-    case llvm::Triple::Managarm:
-      TC = std::make_unique<toolchains::Managarm>(*this, Target, Args);
-      break;
     case llvm::Triple::Solaris:
       TC = std::make_unique<toolchains::Solaris>(*this, Target, Args);
       break;

clang/lib/Driver/ToolChains/Gnu.cpp

@@ -226,8 +226,6 @@ static const char *getLDMOption(const llvm::Triple &T, const ArgList &Args) {
       return "elf_iamcu";
     return "elf_i386";
   case llvm::Triple::aarch64:
-    if (T.isOSManagarm())
-      return "aarch64managarm";
     return "aarch64linux";
   case llvm::Triple::aarch64_be:
     return "aarch64linuxb";

clang/lib/Driver/ToolChains/Managarm.cpp

@@ -221,7 +221,6 @@ bool InitHeaderSearch::ShouldAddDefaultIncludePaths(
   case llvm::Triple::Hurd:
   case llvm::Triple::Linux:
   case llvm::Triple::LiteOS:
-  case llvm::Triple::Managarm:
   case llvm::Triple::NaCl:
   case llvm::Triple::NetBSD:
   case llvm::Triple::OpenBSD: