Revert "Reland 2nd attempt: [lld-macho] Fix bug in reading cpuSubType field."

This reverts commit b08acee.
Still breaks tests, see https://reviews.llvm.org/D139572#4003191

Author: nico

lld/MachO/InputFiles.cpp

@@ -231,14 +231,8 @@ std::optional<MemoryBufferRef> macho::readFile(StringRef path) {
       return std::nullopt;
     }
 
-    uint32_t cpuType = read32be(&arch[i].cputype);
-    uint32_t cpuSubtype =
-        read32be(&arch[i].cpusubtype) & ~MachO::CPU_SUBTYPE_MASK;
-
-    // FIXME: LD64 has a more complex fallback logic here.
-    // Consider implementing that as well?
-    if (cpuType != static_cast<uint32_t>(target->cpuType) ||
-        cpuSubtype != target->cpuSubtype)
+    if (read32be(&arch[i].cputype) != static_cast<uint32_t>(target->cpuType) ||
+        read32be(&arch[i].cpusubtype) != target->cpuSubtype)
       continue;
 
     uint32_t offset = read32be(&arch[i].offset);

lld/test/MachO/fat-arch.s

@@ -1,38 +1,16 @@
-# REQUIRES: x86,aarch64
-## FIXME: The tests doesn't run on windows right now because of llvm-mc (can't produce triple=arm64-apple-macos11.0)
-# UNSUPPORTED: system-windows
-
+# REQUIRES: x86
 # RUN: llvm-mc -filetype=obj -triple=i386-apple-darwin %s -o %t.i386.o
 # RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin %s -o %t.x86_64.o
-# RUN: llvm-mc -filetype=obj -triple=arm64-apple-macos11.0 %s -o %t.arm64.o
-
 # RUN: llvm-lipo %t.i386.o %t.x86_64.o -create -o %t.fat.o
 # RUN: %lld -o /dev/null %t.fat.o
+
 # RUN: llvm-lipo %t.i386.o -create -o %t.noarch.o
 # RUN: not %lld -o /dev/null %t.noarch.o 2>&1 | \
 # RUN:    FileCheck %s -DFILE=%t.noarch.o
 # CHECK: error: unable to find matching architecture in [[FILE]]
 
-## Validates that we read the cpu-subtype correctly from a fat exec.
-# RUN: %lld -o %t.x86_64.out %t.x86_64.o
-# RUN: %lld -arch arm64 -o %t.arm64.out %t.arm64.o
-# RUN: llvm-lipo %t.x86_64.out %t.arm64.out -create -o %t.fat.exec.out
-# RUN: %lld %t.x86_64.o -bundle_loader %t.fat.exec.out -bundle -o %t.fat.bundle
-
-# RUN: llvm-otool -h %t.fat.bundle -f %t.fat.exec.out | FileCheck %s --check-prefix=CPU-SUB
-# CPU-SUB: Fat headers
-# CPU-SUB: nfat_arch 2
-# CPU-SUB: architecture 0
-# CPU-SUB-NEXT:    cputype 16777223
-# CPU-SUB-NEXT:    cpusubtype 3
-# CPU-SUB: architecture 1
-# CPU-SUB-NEXT:    cputype 16777228
-# CPU-SUB-NEXT:    cpusubtype 0
-
-# CPU-SUB:            magic     cputype      cpusubtype   caps      filetype   ncmds sizeofcmds      flags
-# CPU-SUB-NEXT:  0xfeedfacf     16777223              3  0x{{.+}}    {{.+}}  {{.+}}    {{.+}}      {{.+}}
-
 .text
 .global _main
 _main:
+  mov $0, %eax
   ret