[Bug target/97779] New: Newest releases/gcc-10 cannot build because lack of PTA_CLDEMOTE

[icenowy at aosc dot io via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97779

            Bug ID: 97779
           Summary: Newest releases/gcc-10 cannot build because lack of
                    PTA_CLDEMOTE
           Product: gcc
           Version: 10.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: icenowy at aosc dot io
  Target Milestone: ---

When building GCC commit 454702f5213a7a8b6b3581c29c817b952ce0f184 on x86-64
natively, I met this failure:

```
In file included from ./tm.h:26,
                 from
/var/cache/acbs/build/acbs.ctuyh9m4/gcc/gcc/gencheck.c:23:
/var/cache/acbs/build/acbs.ctuyh9m4/gcc/gcc/config/i386/i386.h:2481:46: error:
'PTA_CLDEMOTE' was not declared in this scope; did you mean 'PTA_CLZERO'?
 2481 |   | PTA_GFNI | PTA_MOVDIRI | PTA_MOVDIR64B | PTA_CLDEMOTE |
PTA_WAITPKG;
      |                                              ^~~~~~~~~~~~
      |                                              PTA_CLZERO
/var/cache/acbs/build/acbs.ctuyh9m4/gcc/gcc/config/i386/i386.h:2480:24:
warning: 'PTA_TREMONT' defined but not used [-Wunused-variable]
 2480 | const wide_int_bitmask PTA_TREMONT = PTA_GOLDMONT_PLUS | PTA_CLWB
      |                        ^~~~~~~~~~~
```

This seems to be a issue of commit 3ec6a380bda3d2193925e1c017ea2739476cc125 ,
which adds this macro to PTA_TREMONT.