Build error in next-20260223 gcc-plugins/latent_entropy_plugin.so

[Valdis Klētnieks]

Building next-20260223 dies an early death:

  HOSTLD  arch/x86/tools/relocs
  HOSTCC  arch/x86/tools/vdso2c
  HOSTCXX scripts/gcc-plugins/latent_entropy_plugin.so
In file included from scripts/gcc-plugins/latent_entropy_plugin.c:78:
scripts/gcc-plugins/gcc-common.h: In function 'void debug_tree(const_tree)':
scripts/gcc-plugins/gcc-common.h:417:20: error: 'CONST_CAST_TREE' was not 
declared in this scope; did you mean 'CONST_CAST_EXPR'?
  417 |         debug_tree(CONST_CAST_TREE(t));
      |                    ^~~~~~~~~~~~~~~
      |                    CONST_CAST_EXPR
scripts/gcc-plugins/gcc-common.h: In function 'void 
debug_gimple_stmt(const_gimple_ptr)':
scripts/gcc-plugins/gcc-common.h:312:47: error: expected primary-expression 
before ',' token
  312 | #define CONST_CAST_GIMPLE(X) CONST_CAST(gimple, (X))
      |                                               ^
scripts/gcc-plugins/gcc-common.h:422:27: note: in expansion of macro 
'CONST_CAST_GIMPLE'
  422 |         debug_gimple_stmt(CONST_CAST_GIMPLE(s));
      |                           ^~~~~~~~~~~~~~~~~
scripts/gcc-plugins/gcc-common.h:312:30: error: 'CONST_CAST' was not declared 
in this scope; did you mean 'CONST_INT'?
  312 | #define CONST_CAST_GIMPLE(X) CONST_CAST(gimple, (X))
      |                              ^~~~~~~~~~
scripts/gcc-plugins/gcc-common.h:422:27: note: in expansion of macro 
'CONST_CAST_GIMPLE'
  422 |         debug_gimple_stmt(CONST_CAST_GIMPLE(s));
      |                           ^~~~~~~~~~~~~~~~~
make[3]: *** [scripts/gcc-plugins/Makefile:54: 
scripts/gcc-plugins/latent_entropy_plugin.so] Error 1
make[2]: *** [scripts/Makefile.build:546: scripts/gcc-plugins] Error 2
make[1]: *** [/usr/src/linux-next/Makefile:1316: scripts] Error 2
make: *** [Makefile:248: __sub-make] Error 2

'git blame' isn't showing any recent changes..

next-20260109 built OK.   Any ideas before I start bisecting in more detail?