[clang] [HLSL][NFC] Move IsIntangibleType from SemaHLSL to Type to make it accessible outside of Sema (PR #113206)

[Damyan Pepper via cfe-commits]

================
@@ -5030,6 +5030,29 @@ bool Type::hasSizedVLAType() const {
   return false;
 }
 
+bool Type::isHLSLIntangibleType() const {
+  const Type *Ty = getUnqualifiedDesugaredType();
+
+  // check if it's a builtin type first (simple check, no need to cache it)
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damyanp wrote:

> no need to cache it

This suggests to me that we cache some of the other results?  Is that correct?

Oh, I see that this is just moved code, may be worth cleaning the comment up at some point if it is just muddying the water.

https://github.com/llvm/llvm-project/pull/113206