[gcc r12-3721] ipa-fnsummary: Remove inconsistent bp_pack_value

[Kewen Lin <linkw@gcc.gnu.org>]

https://gcc.gnu.org/g:63c6446f77b9001d26f973114450d790749f282b

commit r12-3721-g63c6446f77b9001d26f973114450d790749f282b
Author: Kewen Lin <linkw@linux.ibm.com>
Date:   Mon Sep 20 21:00:04 2021 -0500

    ipa-fnsummary: Remove inconsistent bp_pack_value
    
    There is one inconsistent bit-field streaming out and in.
    On the side of streaming in:
    
        bp_pack_value (&bp, info->inlinable, 1);
        bp_pack_value (&bp, false, 1);
        bp_pack_value (&bp, info->fp_expressions, 1);
    
    while on the side of the streaming out:
    
        info->inlinable = bp_unpack_value (&bp, 1);
        info->fp_expressions = bp_unpack_value (&bp, 1)
    
    The removal of Cilk Plus support r8-4956 missed to remove
    the streaming out of the bit, instead just change the value
    for streaming out to be always false.
    
    By hacking fp_expression_p to always return true, I can see
    it reads the wrong fp_expressions value (false) out in wpa.
    
    gcc/ChangeLog:
    
            * ipa-fnsummary.c (ipa_fn_summary_write): Remove inconsistent
            bitfield stream out.

Diff:
---
 gcc/ipa-fnsummary.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/gcc/ipa-fnsummary.c b/gcc/ipa-fnsummary.c
index 2470937460f..31199919405 100644
--- a/gcc/ipa-fnsummary.c
+++ b/gcc/ipa-fnsummary.c
@@ -4652,7 +4652,6 @@ ipa_fn_summary_write (void)
 	  info->time.stream_out (ob);
 	  bp = bitpack_create (ob->main_stream);
 	  bp_pack_value (&bp, info->inlinable, 1);
-	  bp_pack_value (&bp, false, 1);
 	  bp_pack_value (&bp, info->fp_expressions, 1);
 	  streamer_write_bitpack (&bp);
 	  streamer_write_uhwi (ob, vec_safe_length (info->conds));