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longlong.h for RISCV should define count_leading_zeros and count_trailing_zeros and COUNT_LEADING_ZEROS_0 when ZBB is enabled. The following patch patch fixes the bug reported in, https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110181 The divdi3 on riscv32 with zbb extension generates __clz_tab instead of genearating __builtin_clzll/__builtin_clz which is not efficient since lookup table is emitted. Updating longlong.h to use this __builtin_clzll/__builtin_clz generates optimized code for the instruction. PR target/110181 include/ChangeLog * longlong.h [__riscv] (count_leading_zeros): Define. [__riscv] (count_trailing_zeros): Likewise. [__riscv] (COUNT_LEADING_ZEROS_0): Likewise.
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