[gcc r13-1109] c++: Use better module partition naming

[Nathan Sidwell <nathan@gcc.gnu.org>]

https://gcc.gnu.org/g:052d89537a4c09e1e1437042e2d1ea215656325f

commit r13-1109-g052d89537a4c09e1e1437042e2d1ea215656325f
Author: Nathan Sidwell <nathan@acm.org>
Date:   Fri Jun 10 11:57:38 2022 -0700

    c++: Use better module partition naming
    
    It turns out that 'implementation partition' is not a term used in the
    std, and is confusing to users.  Let's use the better term 'internal
    partition'.  While there, adjust header unit naming.
    
            gcc/cp/
            * module.cc (module_state::write_readme): Use less confusing
            importable unit names.

Diff:
---
 gcc/cp/module.cc | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/gcc/cp/module.cc b/gcc/cp/module.cc
index 5566c49490f..b3fbd467ecb 100644
--- a/gcc/cp/module.cc
+++ b/gcc/cp/module.cc
@@ -13962,11 +13962,11 @@ module_state::write_readme (elf_out *to, cpp_reader *reader, const char *dialect
 
   readme.begin (false);
 
-  readme.printf ("GNU C++ %smodule%s%s",
-		 is_header () ? "header " : is_partition () ? "" : "primary ",
-		 is_header () ? ""
-		 : is_interface () ? " interface" : " implementation",
-		 is_partition () ? " partition" : "");
+  readme.printf ("GNU C++ %s",
+		 is_header () ? "header unit"
+		 : !is_partition () ? "primary interface"
+		 : is_interface () ? "interface partition"
+		 : "internal partition");
 
   /* Compiler's version.  */
   readme.printf ("compiler: %s", version_string);