OpenMP 4.5: implemented support of schedule(simd:guided) and

schedule(simd:runtime) - library part. Compiler generation should use newly
introduced scheduling kinds kmp_sch_guided_simd = 46, kmp_sch_runtime_simd = 47,
as parameters to __kmpc_dispatch_init_* entries.

Differential Revision: https://reviews.llvm.org/D31602

llvm-svn: 304724