Adding Loongarch64 to OpenBSD parts (llvm#149737)

Adding Loongarch64 to OpenBSD parts

(cherry picked from commit 5eecbc0)

Author: nerfur

clang/lib/Basic/Targets.cpp

@@ -769,6 +769,9 @@ std::unique_ptr<TargetInfo> AllocateTarget(const llvm::Triple &Triple,
     case llvm::Triple::FreeBSD:
       return std::make_unique<FreeBSDTargetInfo<LoongArch64TargetInfo>>(Triple,
                                                                         Opts);
+    case llvm::Triple::OpenBSD:
+      return std::make_unique<OpenBSDTargetInfo<LoongArch64TargetInfo>>(Triple,
+                                                                        Opts);
     default:
       return std::make_unique<LoongArch64TargetInfo>(Triple, Opts);
     }

clang/lib/Basic/Targets/OSTargets.h

@@ -496,6 +496,7 @@ class LLVM_LIBRARY_VISIBILITY OpenBSDTargetInfo : public OSTargetInfo<Target> {
     case llvm::Triple::sparcv9:
       this->MCountName = "_mcount";
       break;
+    case llvm::Triple::loongarch64:
     case llvm::Triple::riscv64:
       break;
     }

clang/lib/Driver/ToolChains/OpenBSD.cpp

@@ -161,7 +161,7 @@ void openbsd::Linker::ConstructJob(Compilation &C, const JobAction &JA,
   if (Nopie || Profiling)
     CmdArgs.push_back("-nopie");
 
-  if (Triple.isRISCV64()) {
+  if (Triple.isLoongArch64() || Triple.isRISCV64()) {
     CmdArgs.push_back("-X");
     if (Args.hasArg(options::OPT_mno_relax))
       CmdArgs.push_back("--no-relax");

clang/test/Driver/openbsd.c

@@ -127,9 +127,12 @@
 // UNWIND-TABLES: "-funwind-tables=2"
 // NO-UNWIND-TABLES-NOT: "-funwind-tables=2"
 
-// Check that the -X and --no-relax flags are passed to the linker on riscv64
+// Check that the -X and --no-relax flags are passed to the linker
+// RUN: %clang --target=loongarch64-unknown-openbsd -mno-relax -### %s 2>&1 \
+// RUN:   | FileCheck --check-prefix=LA64-FLAGS %s
 // RUN: %clang --target=riscv64-unknown-openbsd -mno-relax -### %s 2>&1 \
 // RUN:   | FileCheck -check-prefix=RISCV64-FLAGS %s
+// LA64-FLAGS: "-X" "--no-relax"
 // RISCV64-FLAGS: "-X" "--no-relax"
 
 // Check passing LTO flags to the linker