[llvm] [TableGen] Remove incorrect flag checking on patterns (PR #176443)

[Craig Topper via llvm-commits]

topperc wrote:

Some targets like RISC-V and LoongArch set `guessInstructionProperties = 0` so those targets might be more dependent on these checks to validate their flags.

https://github.com/llvm/llvm-project/pull/176443