[AIX][Clang] Fix XL product name in AIX XL compatibility warning

[ZarkoCA]

Summary

Correct the XLC/C++ version in the warning message to use the information from
XL's -qversion output.

[rzurob]

Please change to "IBM XL C/C++ for AIX 16.1.0". i.e. No ", V". Thanks.

[ZarkoCA]

• Remove V from version number

[ZarkoCA]

• Remove comma from product name

[rzurob]

LGTM

clang/include/clang/Basic/DiagnosticSemaKinds.td

 def err_attribute_aligned_too_great : Error<
   "requested alignment must be %0 bytes or smaller">;
 def warn_assume_aligned_too_great
     : Warning<"requested alignment must be %0 bytes or smaller; maximum "
               "alignment assumed">,
       InGroup<DiagGroup<"builtin-assume-aligned-alignment">>;
 def warn_not_xl_compatible
     : Warning<"requesting an alignment of 16 bytes or greater for struct"
-              " members is not binary compatible with AIX XL 16.1 and older">,
+              " members is not binary compatible with IBM XL C/C++ for AIX"
+              " 16.1.0 and older">,
       InGroup<AIXCompat>;
 def warn_redeclaration_without_attribute_prev_attribute_ignored : Warning<
   "%q0 redeclared without %1 attribute: previous %1 ignored">,
   InGroup<MicrosoftInconsistentDllImport>;
 def warn_redeclaration_without_import_attribute : Warning<
   "%q0 redeclared without 'dllimport' attribute: 'dllexport' attribute added">,
   InGroup<MicrosoftInconsistentDllImport>;
 def warn_dllimport_dropped_from_inline_function : Warning<

clang/test/Sema/aix-attr-align.c

 // off-no-diagnostics
 // RUN: %clang_cc1 -triple powerpc64-ibm-aix-xcoff -verify -fsyntax-only %s
 // RUN: %clang_cc1 -triple powerpc-ibm-aix-xcoff -verify -fsyntax-only %s
 // RUN: %clang_cc1 -triple powerpc64-ibm-aix-xcoff -verify=off -Wno-aix-compat -fsyntax-only %s
 // RUN: %clang_cc1 -triple powerpc-ibm-aix-xcoff -verify=off -Wno-aix-compat -fsyntax-only %s
 // RUN: %clang_cc1 -triple powerpc64le-unknown-linux -verify=off -fsyntax-only %s
 
 struct S {
   int a[8] __attribute__((aligned(8))); // no-warning
 };
 
 struct T {
-  int a[4] __attribute__((aligned(16))); // expected-warning {{requesting an alignment of 16 bytes or greater for struct members is not binary compatible with AIX XL 16.1 and older}}
+  int a[4] __attribute__((aligned(16))); // expected-warning {{requesting an alignment of 16 bytes or greater for struct members is not binary compatible with IBM XL C/C++ for AIX 16.1.0 and older}}
 };
 
 struct U {
-  int a[2] __attribute__((aligned(32))); // expected-warning {{requesting an alignment of 16 bytes or greater for struct members is not binary compatible with AIX XL 16.1 and older}}
+  int a[2] __attribute__((aligned(32))); // expected-warning {{requesting an alignment of 16 bytes or greater for struct members is not binary compatible with IBM XL C/C++ for AIX 16.1.0 and older}}
 };
 
 int a[8] __attribute__((aligned(8)));  // no-warning
 int b[4] __attribute__((aligned(16))); // no-warning
 int c[2] __attribute__((aligned(32))); // no-warning