Subzero. X8664. Fixes various small bugs.

src/IceInstX86BaseImpl.h

 //===- subzero/src/IceInstX86BaseImpl.h - Generic X86 instructions -*- C++ -*=//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 583 matching lines @@
     (void)Mem;
     assert(Mem->getSegmentRegister() == X86OperandMem::DefaultSegment);
     llvm::report_fatal_error("Assembler can't jmp to memory operand");
   } else if (const auto *CR = llvm::dyn_cast<ConstantRelocatable>(Target)) {
     assert(CR->getOffset() == 0 && "We only support jumping to a function");
     Asm->jmp(CR);
   } else if (const auto *Imm = llvm::dyn_cast<ConstantInteger32>(Target)) {
     // NaCl trampoline calls refer to an address within the sandbox directly.
     // This is usually only needed for non-IRT builds and otherwise not very
     // portable or stable. Usually this is only done for "calls" and not jumps.
-    // TODO(jvoung): Support this when there is a lowering that actually
-    // triggers this case.
-    (void)Imm;
-    llvm::report_fatal_error("Unexpected jmp to absolute address");
+    Asm->jmp(AssemblerImmediate(Imm->getValue()));
   } else {
     llvm::report_fatal_error("Unexpected operand type");
   }
 }
 
 template <typename TraitsType>
 void InstImpl<TraitsType>::InstX86Jmp::dump(const Cfg *Func) const {
   if (!BuildDefs::dump())
     return;
   Ostream &Str = Func->getContext()->getStrDump();
@@ skipping 2291 matching lines @@
     return;
   Ostream &Str = Func->getContext()->getStrDump();
   Str << "IACA_END";
 }
 
 } // end of namespace X86NAMESPACE
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICEINSTX86BASEIMPL_H