[X86] Strengthen the setting of inline asm constraints.

The setting of the inline asm constraints was implicitly relying on the
order of the register classes in the file generated by tablegen.
Since, we do not have any control on that order, make sure we do not
depend on it anymore.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@268953 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed