Refactor RyuJIT/x86 long decomposition code

src/jit/CMakeLists.txt

@@ -84,6 +84,7 @@ if(CLR_CMAKE_TARGET_ARCH_AMD64)
 elseif(CLR_CMAKE_TARGET_ARCH_ARM)
   set( ARCH_SOURCES
     codegenarm.cpp
+    decomposelongs.cpp
     emitarm.cpp
     lowerarm.cpp
     targetarm.cpp
@@ -92,6 +93,7 @@ elseif(CLR_CMAKE_TARGET_ARCH_ARM)
 elseif(CLR_CMAKE_TARGET_ARCH_I386)
   set( ARCH_SOURCES
     codegenxarch.cpp
+    decomposelongs.cpp
     emitxarch.cpp
     lowerxarch.cpp
     simd.cpp

src/jit/compiler.h

@@ -1385,6 +1385,10 @@ class   Compiler
     friend class LclVarDsc;
     friend class TempDsc;
 
+#ifndef _TARGET_64BIT_
+    friend class DecomposeLongs;
+#endif // !_TARGET_64BIT_
+
 /*
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