[AVX] Recorganize X86ShuffleDecode into its own library

(LLVMX86Utils.a) to break cyclic library dependencies between
LLVMX86CodeGen.a and LLVMX86AsmParser.a.  Previously this code was in
a header file and marked static but AVX requires some additional
functionality here that won't be used by all clients.  Since including
unused static functions causes a gcc compiler warning, keeping it as a
header would break builds that use -Werror.  Putting this in its own
library solves both problems at once.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125765 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/X86/InstPrinter/X86InstComments.cpp

@@ -16,7 +16,7 @@
 #include "X86GenInstrNames.inc"
 #include "llvm/MC/MCInst.h"
 #include "llvm/Support/raw_ostream.h"
-#include "../X86ShuffleDecode.h"
+#include "../Utils/X86ShuffleDecode.h"
 using namespace llvm;
 
 //===----------------------------------------------------------------------===//