[committed][RISC-V] Remove errant hunk of code

[Jeff Law via Gcc-patches]

I'm using this hunk locally to more thoroughly exercise the zicond paths 
due to inaccuracies elsewhere in the costing model.  It was never 
supposed to be part of the costing commit though.  And as we've seen 
it's causing problems with the vector bits.

While my testing isn't complete, this hunk was never supposed to be 
pushed and it's causing problems.  So I'm just ripping it out.

There's a bigger TODO in this space WRT a top-to-bottom evaluation of 
the costing on RISC-V.  I'm still formulating what that evaluation is 
going to look like, so don't hold your breath waiting on it.

Pushed to the trunk.
commit d61efa3cd3378be38738bfb5139925d1505c1325
Author: Jeff Law <jeffreya...@gmail.com>
Date:   Thu Aug 3 10:57:23 2023 -0400

    [committed][RISC-V] Remove errant hunk of code
    
    I'm using this hunk locally to more thoroughly exercise the zicond paths
    due to inaccuracies elsewhere in the costing model.  It was never
    supposed to be part of the costing commit though.  And as we've seen
    it's causing problems with the vector bits.
    
    While my testing isn't complete, this hunk was never supposed to be
    pushed and it's causing problems.  So I'm just ripping it out.
    
    There's a bigger TODO in this space WRT a top-to-bottom evaluation of
    the costing on RISC-V.  I'm still formulating what that evaluation is
    going to look like, so don't hold your breath waiting on it.
    
    Pushed to the trunk.
    
    gcc/
    
            * config/riscv/riscv.cc (riscv_rtx_costs): Remove errant hunk from
            recent commit.

diff --git a/gcc/config/riscv/riscv.cc b/gcc/config/riscv/riscv.cc
index 9e75450aa97..d8fab68dbb4 100644
--- a/gcc/config/riscv/riscv.cc
+++ b/gcc/config/riscv/riscv.cc
@@ -2913,16 +2913,6 @@ riscv_rtx_costs (rtx x, machine_mode mode, int 
outer_code, int opno ATTRIBUTE_UN
        }
       return false;
 
-    case SET:
-      /* A simple SET with a register destination takes its cost solely from
-        the SET_SRC operand.  */
-      if (outer_code == INSN && REG_P (SET_DEST (x)))
-       {
-         *total = riscv_rtx_costs (SET_SRC (x), mode, SET, opno, total, speed);
-         return true;
-       }
-      return false;
-
     default:
       return false;
     }