SIMD clang builtin fixes

This PR fixes the constant parameters type definition for the shuffle.sci.* clang builtins so that they constant fold. It also adds a check on the value range of constant parameters for add.h, sub.h, shuffle.sci.h, cplxmul.r, cplxmul.i and subrotmj. Finally it fixes the clang codegen test to use only in range values for the shuffle.sci.h test cases.