A64: Make the Decoder a template

test/cctest/test-fuzz-a64.cc

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 #include <stdlib.h>
 #include "cctest.h"
 
 #include "a64/decoder-a64.h"
+#include "a64/decoder-a64-inl.h"
 #include "a64/disasm-a64.h"
 
 using namespace v8::internal;
 
 TEST(FUZZ_decoder) {
   // Feed noise into the decoder to check that it doesn't crash.
   // 43 million = ~1% of the instruction space.
   static const int instruction_count = 43 * 1024 * 1024;
 
   uint16_t seed[3] = {1, 2, 3};
   seed48(seed);
 
-  Decoder decoder;
+  Decoder<DispatchingDecoderVisitor> decoder;
   Instruction buffer[kInstructionSize];
 
   for (int i = 0; i < instruction_count; i++) {
     uint32_t instr = mrand48();
     buffer->SetInstructionBits(instr);
     decoder.Decode(buffer);
   }
 }
 
 
 TEST(FUZZ_disasm) {
   // Feed noise into the disassembler to check that it doesn't crash.
   // 9 million = ~0.2% of the instruction space.
   static const int instruction_count = 9 * 1024 * 1024;
 
   uint16_t seed[3] = {42, 43, 44};
   seed48(seed);
 
-  Decoder decoder;
+  Decoder<DispatchingDecoderVisitor> decoder;
   Disassembler disasm;
   Instruction buffer[kInstructionSize];
 
   decoder.AppendVisitor(&disasm);
   for (int i = 0; i < instruction_count; i++) {
     uint32_t instr = mrand48();
     buffer->SetInstructionBits(instr);
     decoder.Decode(buffer);
   }
 }