Revert r198238 and add FP disassembler tests. It didn't work and I didn't realized we had no FP disassembler test cases.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198265 91177308-0d34-0410-b5e6-96231b3b80d8

utils/TableGen/X86ModRMFilters.cpp

@@ -17,6 +17,8 @@ void DumbFilter::anchor() { }
 
 void ModFilter::anchor() { }
 
+void AddRegEscapeFilter::anchor() { }
+
 void ExtendedFilter::anchor() { }
 
 void ExactFilter::anchor() { }