Code Clean Up

[SchrodingerZhu]

I rushed to put all operations in but apparently there are some warnings and dirty code sections. Clean up is needed.

• CI warnings
• wrongly-documented operations

  mlir-gccjit/include/mlir-gccjit/IR/GCCJITOps.td

  Line 545 in 968a9b6

  %res = gccjit.call @foo ( %arg0 : !gccjit.int<i32>, %arg1 : !gccjit.int<i32> ) : !gccjit.int<i32>

• parameter constraints in TableGen
• Interface/traits to keep track of side effect or anything else commonly required by codegen
• more....

[Lancern]

Another thing we need to start checking is putting parameter constraints in TableGen AMAP instead of checking these constraints manually in verifiers.