MC] Provide an MCTargetOptions to implementors of MCAsmBackendCtorTy, NFC

Some targets, notably AArch64 for ILP32, have different relocation encodings
based upon the ABI. This is an enabling change, so a future patch can use the
ABIName from MCTargetOptions to chose which relocations to use. Tested using
check-llvm.

The corresponding change to clang is in: http://reviews.llvm.org/D16538

Patch by: Joel Jones

Differential Revision: https://reviews.llvm.org/D16213

llvm-svn: 276654
diff --git a/llvm/lib/Target/BPF/MCTargetDesc/BPFAsmBackend.cpp b/llvm/lib/Target/BPF/MCTargetDesc/BPFAsmBackend.cpp
index 2de40aa..a6cd200 100644
--- a/llvm/lib/Target/BPF/MCTargetDesc/BPFAsmBackend.cpp
+++ b/llvm/lib/Target/BPF/MCTargetDesc/BPFAsmBackend.cpp
@@ -96,12 +96,14 @@
 
 MCAsmBackend *llvm::createBPFAsmBackend(const Target &T,
                                         const MCRegisterInfo &MRI,
-                                        const Triple &TT, StringRef CPU) {
+                                        const Triple &TT, StringRef CPU,
+                                        const MCTargetOptions&) {
   return new BPFAsmBackend(/*IsLittleEndian=*/true);
 }
 
 MCAsmBackend *llvm::createBPFbeAsmBackend(const Target &T,
                                           const MCRegisterInfo &MRI,
-                                          const Triple &TT, StringRef CPU) {
+                                          const Triple &TT, StringRef CPU,
+                                          const MCTargetOptions&) {
   return new BPFAsmBackend(/*IsLittleEndian=*/false);
 }