[Clang] Add BuiltinTemplates.td to generate code for builtin templates (#123736)

This makes it significantly easier to add new builtin templates, since
you only have to modify two places instead of a dozen or so.

The `BuiltinTemplates.td` could also be extended to generate
documentation from it in the future.

1 files changed, 6 insertions, 12 deletions

diff --git a/clang/lib/Sema/SemaLookup.cpp b/clang/lib/Sema/SemaLookup.cpp
index 0f5b742..aecf8ed 100644
--- a/clang/lib/Sema/SemaLookup.cpp
+++ b/clang/lib/Sema/SemaLookup.cpp
@@ -924,18 +924,12 @@ bool Sema::LookupBuiltin(LookupResult &R) {
     IdentifierInfo *II = R.getLookupName().getAsIdentifierInfo();
     if (II) {
       if (getLangOpts().CPlusPlus && NameKind == Sema::LookupOrdinaryName) {
-        if (II == getASTContext().getMakeIntegerSeqName()) {
-          R.addDecl(getASTContext().getMakeIntegerSeqDecl());
-          return true;
-        }
-        if (II == getASTContext().getTypePackElementName()) {
-          R.addDecl(getASTContext().getTypePackElementDecl());
-          return true;
-        }
-        if (II == getASTContext().getBuiltinCommonTypeName()) {
-          R.addDecl(getASTContext().getBuiltinCommonTypeDecl());
-          return true;
-        }
+#define BuiltinTemplate(BIName)                                                \
+  if (II == getASTContext().get##BIName##Name()) {                             \
+    R.addDecl(getASTContext().get##BIName##Decl());                            \
+    return true;                                                               \
+  }
+#include "clang/Basic/BuiltinTemplates.inc"
       }
 
       // Check if this is an OpenCL Builtin, and if so, insert its overloads.