Wrong normalization for some clauses followed by expressions.

[XinyaoYI]

Clauses followed by expressions like simdlen() is merged as below:
#pragma omp simd simdlen(8) simdlen(128) (this format is illegal)
result: #pragma omp simd simdlen(8,128)

ompparser will give a message: "Cannot have two simdlen clause for the directive, ignored" and then gives the output.