[committed][RISC-V] Turn on overlap_op_by_pieces for generic-ooo tuning

[Jeff Law]

Per quick email exchange with Palmer.  Given the triviality, I'm just 
pushing it.

jeffcommit 9f14f1978260148d4d6208dfd73df1858e623758
Author: Jeff Law <j...@ventanamicro.com>
Date:   Tue May 7 15:34:16 2024 -0600
    [committed][RISC-V] Turn on overlap_op_by_pieces for generic-ooo tuning
    
    Per quick email exchange with Palmer.  Given the triviality, I'm just 
pushing
    it.
    
    gcc/
            * config/riscv/riscv.cc (generic_ooo_tune_info): Turn on
            overlap_op_by_pieces.

diff --git a/gcc/config/riscv/riscv.cc b/gcc/config/riscv/riscv.cc
index a9b57d41184..62207b6b227 100644
--- a/gcc/config/riscv/riscv.cc
+++ b/gcc/config/riscv/riscv.cc
@@ -536,7 +536,7 @@ static const struct riscv_tune_param generic_ooo_tune_info 
= {
   4,                                           /* fmv_cost */
   false,                                       /* slow_unaligned_access */
   false,                                       /* use_divmod_expansion */
-  false,                                       /* overlap_op_by_pieces */
+  true,                                                /* overlap_op_by_pieces 
*/
   RISCV_FUSE_NOTHING,                           /* fusible_ops */
   &generic_vector_cost,                                /* vector cost */
 };