Added __builtin_riscv_cv_simd_neg_[h,b]

Created by: MaryBennett

Issue #54 CORE-V: SIMD __builtin_riscv_cv_simd_neg_h and __builtin_riscv_cv_simd_neg_b needs implementing

Files Changed:

• config/riscv/corev.def: Added new builtins.
• config/riscv/corev.md: Likewise.
• testsuite/gcc.target/riscv/cv-simd-neg-b-compile-1.c: Created.
• testsuite/gcc.target/riscv/cv-simd-neg-h-compile-1.c: Likewise.