[SystemZ] Support execution hint instructions

This adds assembler support for the instructions provided by the
execution-hint facility (NIAI and BP(R)P).  This required adding
support for the new relocation types for 12-bit and 24-bit PC-
relative offsets used by the BP(R)P instructions.

llvm-svn: 288031
diff --git a/llvm/lib/Target/SystemZ/Disassembler/SystemZDisassembler.cpp b/llvm/lib/Target/SystemZ/Disassembler/SystemZDisassembler.cpp
index a1b8422..1806e01 100644
--- a/llvm/lib/Target/SystemZ/Disassembler/SystemZDisassembler.cpp
+++ b/llvm/lib/Target/SystemZ/Disassembler/SystemZDisassembler.cpp
@@ -247,12 +247,24 @@
   return MCDisassembler::Success;
 }
 
+static DecodeStatus decodePC12DBLBranchOperand(MCInst &Inst, uint64_t Imm,
+                                               uint64_t Address,
+                                               const void *Decoder) {
+  return decodePCDBLOperand<12>(Inst, Imm, Address, true, Decoder);
+}
+
 static DecodeStatus decodePC16DBLBranchOperand(MCInst &Inst, uint64_t Imm,
                                                uint64_t Address,
                                                const void *Decoder) {
   return decodePCDBLOperand<16>(Inst, Imm, Address, true, Decoder);
 }
 
+static DecodeStatus decodePC24DBLBranchOperand(MCInst &Inst, uint64_t Imm,
+                                               uint64_t Address,
+                                               const void *Decoder) {
+  return decodePCDBLOperand<24>(Inst, Imm, Address, true, Decoder);
+}
+
 static DecodeStatus decodePC32DBLBranchOperand(MCInst &Inst, uint64_t Imm,
                                                uint64_t Address,
                                                const void *Decoder) {