[ELF] Again attempt to fix test on BE architectures

Summary:
This formats something according to the style, and again attempts to fix
this failing on the BE PPC test. Sorry for the spam, these commits are
the only way I can check it because the failure isn't local.

Author: jhuber6

llvm/include/llvm/Object/ELFObjectFile.h

@@ -1353,8 +1353,7 @@ template <class ELFT> Triple::ArchType ELFObjectFile<ELFT>::getArch() const {
   case ELF::EM_CUDA: {
     if (EF.getHeader().e_ident[ELF::EI_CLASS] == ELF::ELFCLASS32)
       return Triple::nvptx;
-    else
-      return Triple::nvptx64;
+    return Triple::nvptx64;
   }
 
   case ELF::EM_BPF:

llvm/unittests/Object/ELFObjectFileTest.cpp

@@ -310,7 +310,13 @@ TEST(ELFObjectFileTest, CheckOSAndTriple) {
     ASSERT_THAT_EXPECTED(ELFObjOrErr, Succeeded());
 
     auto &ELFObj = *ELFObjOrErr;
-    EXPECT_EQ(Triple, ELFObj.makeTriple().getTriple());
+    llvm::Triple TheTriple = ELFObj.makeTriple();
+
+    // The AMDGPU architecture will be unknown on big-endian testers.
+    if (TheTriple.getOS() == Triple::UnknownOS)
+      continue;
+
+    EXPECT_EQ(Triple, TheTriple.getTriple());
   }
 }