Revert "[Basic] Support 64-bit x86 target for UEFI"

This reverts commit 315a407.
The new test added fails to link the unit tests correctly and breaks
certain buildbots.

Author: Prabhuk

llvm/lib/IR/DataLayout.cpp

@@ -171,7 +171,7 @@ const char *DataLayout::getManglingComponent(const Triple &T) {
     return "-m:l";
   if (T.isOSBinFormatMachO())
     return "-m:o";
-  if ((T.isOSWindows() || T.isUEFI()) && T.isOSBinFormatCOFF())
+  if (T.isOSWindows() && T.isOSBinFormatCOFF())
     return T.getArch() == Triple::x86 ? "-m:x" : "-m:w";
   if (T.isOSBinFormatXCOFF())
     return "-m:a";

llvm/lib/TargetParser/Triple.cpp

@@ -799,8 +799,6 @@ static Triple::ObjectFormatType getDefaultFormat(const Triple &T) {
   case Triple::x86_64:
     if (T.isOSWindows())
       return Triple::COFF;
-    else if (T.isUEFI())
-      return Triple::COFF;
     return Triple::ELF;
 
   case Triple::aarch64_be:

llvm/unittests/IR/DataLayoutTest.cpp

@@ -11,7 +11,6 @@
 #include "llvm/IR/LLVMContext.h"
 #include "llvm/IR/Module.h"
 #include "llvm/IR/Type.h"
-#include "llvm/TargetParser/Triple.h"
 #include "llvm/Testing/Support/Error.h"
 #include "gtest/gtest.h"
 
@@ -105,11 +104,4 @@ TEST(DataLayoutTest, VectorAlign) {
   EXPECT_EQ(Align(4 * 8), DL->getPrefTypeAlign(V8F32Ty));
 }
 
-TEST(DataLayoutTest, UEFI) {
-  Triple TT = Triple("x86_64-unknown-uefi");
-
-  // Test UEFI X86_64 Mangling Component.
-  EXPECT_STREQ(DataLayout::getManglingComponent(TT), "-m:w");
-}
-
 } // anonymous namespace

llvm/unittests/TargetParser/TripleTest.cpp

@@ -462,7 +462,6 @@ TEST(TripleTest, ParsedIDs) {
   EXPECT_EQ(Triple::UnknownVendor, T.getVendor());
   EXPECT_EQ(Triple::UEFI, T.getOS());
   EXPECT_EQ(Triple::UnknownEnvironment, T.getEnvironment());
-  EXPECT_EQ(Triple::COFF, T.getObjectFormat());
 
   T = Triple("wasm32-unknown-unknown");
   EXPECT_EQ(Triple::wasm32, T.getArch());