CPU: Merge the predecoder and decoder.

These classes are always used together, and merging them will give the ISAs
more flexibility in how they cache things and manage the process.

--HG--
rename : src/arch/x86/predecoder_tables.cc => src/arch/x86/decoder_tables.cc

src/cpu/inorder/cpu.cc

@@ -1773,9 +1773,9 @@ InOrderCPU::getDTBPtr()
 }
 
 TheISA::Decoder *
-InOrderCPU::getDecoderPtr()
+InOrderCPU::getDecoderPtr(unsigned tid)
 {
-    return &resPool->getInstUnit()->decoder;
+    return resPool->getInstUnit()->decoder[tid];
 }
 
 Fault