[LLVMbugs] Unecessary linking and compilation

[Henrik Bach]

Hi LLVM'ers

I've not changed anything in the build or source tree, but tblgen gets 
relinked and thus all *.td files get regenerated and later compiled:
------------------------
...
Linking tblgen debug executable (without symbols)
14 @ /C/Projects/build/MinGW/llvm/mklib --tag=disable-shared --silent 
--tag=CXX --mode=link g++ -g -L/C/Projects/build/MinGW/llvm/lib/Debug 
-L/C/Projects/build/MinGW/llvm/lib/Debug -o 
/C/Projects/build/MinGW/llvm/tools/Debug/tblgen 
/C/Projects/build/MinGW/llvm/utils/TableGen/Debug/AsmWriterEmitter.lo 
/C/Projects/build/MinGW/llvm/utils/TableGen/Debug/CodeEmitterGen.lo 
/C/Projects/build/MinGW/llvm/utils/TableGen/Debug/CodeGenTarget.lo 
/C/Projects/build/MinGW/llvm/utils/TableGen/Debug/FileLexer.lo 
/C/Projects/build/MinGW/llvm/utils/TableGen/Debug/FileParser.lo 
/C/Projects/build/MinGW/llvm/utils/TableGen/Debug/InstrInfoEmitter.lo 
/C/Projects/build/MinGW/llvm/utils/TableGen/Debug/InstrSelectorEmitter.lo 
/C/Projects/build/MinGW/llvm/utils/TableGen/Debug/Record.lo 
/C/Projects/build/MinGW/llvm/utils/TableGen/Debug/RegisterInfoEmitter.lo 
/C/Projects/build/MinGW/llvm/utils/TableGen/Debug/TableGen.lo 
/C/Projects/build/MinGW/llvm/utils/TableGen/Debug/TableGenBackend.lo 
-lsupport -lLLVMsystem -ldbghelp -export-dynamic
======= Finished building tblgen debug executable (without symbols) =======
...
Building X86.td register information header with tblgen
Building X86.td register names with tblgen
Building X86.td register info implementation with tblgen
Building X86.td instruction names with tblgen
Building X86.td instruction information with tblgen
Building X86.td AT&T assembly writer with tblgen
Building X86.td Intel assembly writer with tblgen
make[3]: Leaving directory `/C/Projects/build/MinGW/llvm/lib/Target/X86'
make[3]: Entering directory `/C/Projects/build/MinGW/llvm/lib/Target/X86'
Compiling X86AsmPrinter.cpp
...
------------------------

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