[X86][AsmParser] Improve base/index register checks.

-Ensure EIP isn't used with an index reigster.
-Ensure EIP isn't used as index register.
-Ensure base register isn't a vector register.
-Ensure eiz/riz usage matches the size of their base register.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@335412 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed