[committed] Fix PA bootstrap

[Jeff Law via Gcc-patches]

The change to C++-17 broke PA bootstrap as pa.c uses the "register" keyword. 
This patch drops the keyword and should hopefully restore bootstrapping.  It'll
take a day or so to verify.

Committed to the trunk,

Jeff

commit a580aca1b6dad32e621d4c8c8ceaab6d0c52f6c1
Author: Jeff Law <l...@redhat.com>
Date:   Tue Jun 30 23:03:33 2020 -0600

    Fix bootstrap failure on PA
    
    gcc/
            * config/pa/pa.c (pa_emit_move_sequence): Drop register keyword.
            (pa_output_ascii): Likewise.

diff --git a/gcc/config/pa/pa.c b/gcc/config/pa/pa.c
index 711234e597a..07d32877154 100644
--- a/gcc/config/pa/pa.c
+++ b/gcc/config/pa/pa.c
@@ -1631,9 +1631,9 @@ pa_cannot_force_const_mem (machine_mode mode 
ATTRIBUTE_UNUSED, rtx x)
 int
 pa_emit_move_sequence (rtx *operands, machine_mode mode, rtx scratch_reg)
 {
-  register rtx operand0 = operands[0];
-  register rtx operand1 = operands[1];
-  register rtx tem;
+  rtx operand0 = operands[0];
+  rtx operand1 = operands[1];
+  rtx tem;
 
   /* We can only handle indexed addresses in the destination operand
      of floating point stores.  Thus, we need to break out indexed
@@ -3381,7 +3381,7 @@ pa_output_ascii (FILE *file, const char *p, int size)
       int io = 0;
       for (io = 0, co = 0; io < MIN (4, size - i); io++)
        {
-         register unsigned int c = (unsigned char) p[i + io];
+         unsigned int c = (unsigned char) p[i + io];
 
          if (c == '\"' || c == '\\')
            partial_output[co++] = '\\';