[gcc(refs/users/meissner/heads/work005-orig)] powerpc: Restore bootstrap for Darwin.

[Michael Meissner]

https://gcc.gnu.org/g:8005a3e4e7a643ff78086081a3385775924fe828

commit 8005a3e4e7a643ff78086081a3385775924fe828
Author: Iain Sandoe <iain@sandoe.co.uk>
Date:   Thu Jun 25 08:56:23 2020 +0100

    powerpc: Restore bootstrap for Darwin.
    
    Darwin has signed chars and the fields in the insn_data
    struct are const char, which leads to the fail.
    
    gcc/ChangeLog:
    
            * config/rs6000/rs6000-call.c (mma_init_builtins): Cast
            the insn_data n_operands value to unsigned.

Diff:
---
 gcc/config/rs6000/rs6000-call.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/config/rs6000/rs6000-call.c b/gcc/config/rs6000/rs6000-call.c
index d8b85347cc8..3a109fe626f 100644
--- a/gcc/config/rs6000/rs6000-call.c
+++ b/gcc/config/rs6000/rs6000-call.c
@@ -13437,7 +13437,7 @@ mma_init_builtins (void)
 	{
 	  /* This is a normal MMA built-in function.  */
 	  unsigned j = (attr & RS6000_BTC_QUAD) ? 1 : 0;
-	  for (; j < insn_data[icode].n_operands; j++)
+	  for (; j < (unsigned) insn_data[icode].n_operands; j++)
 	    {
 	      machine_mode mode = insn_data[icode].operand[j].mode;
 	      if (gimple_func && mode == PXImode)