[clang] [clang-tools-extra] [clang] Improved canonicalization for template specialization types (PR #135119)

[Erich Keane via cfe-commits]

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@@ -168,6 +168,8 @@ class TemplateArgument {
     LLVM_PREFERRED_TYPE(bool)
     unsigned IsDefaulted : 1;
     uintptr_t V;
+    LLVM_PREFERRED_TYPE(bool)
+    unsigned IsCanonicalExpr : 1;
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erichkeane wrote:

Oh, yeah, definitely agree there.  It would be nice if we spent some time going through the list to try to space-optimize, but as you mentioned, this isn't hte 'worst'.  The  suggestion is mostly that perhaps we can shrink some of the others over time (or this one gets bigger!) and we have some room before it becomes the biggest.

https://github.com/llvm/llvm-project/pull/135119