Fix llvm-mc handing of x86 instructions that take 8-bit unsigned immediates.

Fix llvm-mc handing of x86 instructions that take 8-bit unsigned immediates.

llvm-mc gives an "invalid operand" error for instructions that take an unsigned
immediate which have the high bit set such as:
    pblendw $0xc5, %xmm2, %xmm1
llvm-mc treats all x86 immediates as signed values and range checks them.
A small number of x86 instructions use the imm8 field as a set of bits.
This change only changes those instructions and where the high bit is not
ignored.  The others remain unchanged.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136287 91177308-0d34-0410-b5e6-96231b3b80d8