Fix MSVC build by correcting placement of declspec after r345056

Going by the MSVC toolchains at godbolt.org, declspec comes after the template<...>.

llvm-svn: 345059
diff --git a/llvm/utils/TableGen/FixedLenDecoderEmitter.cpp b/llvm/utils/TableGen/FixedLenDecoderEmitter.cpp
index 361bad3..44cf6ea 100644
--- a/llvm/utils/TableGen/FixedLenDecoderEmitter.cpp
+++ b/llvm/utils/TableGen/FixedLenDecoderEmitter.cpp
@@ -2083,10 +2083,10 @@
      << "// * Support shift (<<, >>) with signed and unsigned integers on the "
         "RHS\n"
      << "// * Support put (<<) to raw_ostream&\n"
+     << "template<typename InsnType>\n"
      << "#if defined(_MSC_VER) && !defined(__clang__)\n"
      << "__declspec(noinline)\n"
      << "#endif\n"
-     << "template<typename InsnType>\n"
      << "static InsnType fieldFromInstruction(InsnType insn, unsigned "
         "startBit,\n"
      << "                                     unsigned numBits, "