[Target] Remove libObject dependency in lib/Target

This removes a couple useless includes and the dependency of X86Desc on Object,
which was useless as well.

Author: francisvm

llvm/lib/Target/PowerPC/MCTargetDesc/PPCAsmBackend.cpp

@@ -20,7 +20,6 @@
 #include "llvm/MC/MCSubtargetInfo.h"
 #include "llvm/MC/MCSymbolELF.h"
 #include "llvm/MC/MCValue.h"
-#include "llvm/Object/MachO.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/TargetRegistry.h"
 using namespace llvm;

llvm/lib/Target/VE/MCTargetDesc/VEMCExpr.cpp

@@ -16,7 +16,6 @@
 #include "llvm/MC/MCContext.h"
 #include "llvm/MC/MCObjectStreamer.h"
 #include "llvm/MC/MCSymbolELF.h"
-#include "llvm/Object/ELF.h"
 
 using namespace llvm;
 

llvm/lib/Target/X86/MCTargetDesc/LLVMBuild.txt

@@ -18,5 +18,5 @@
 type = Library
 name = X86Desc
 parent = X86
-required_libraries = MC MCDisassembler Object Support X86Info X86Utils BinaryFormat
+required_libraries = MC MCDisassembler Support X86Info X86Utils BinaryFormat
 add_to_library_groups = X86