[clang] [AST][RISCV] Preserve RISC-V intrinsic pragma in AST (PR #171981)

[Craig Topper via cfe-commits]

================
@@ -9063,6 +9074,11 @@ void ASTReader::UpdateSema() {
         PointersToMembersPragmaLocation);
   }
   SemaObj->CUDA().ForceHostDeviceDepth = ForceHostDeviceDepth;
+  if (!RISCVVecIntrinsicPragma.empty()) {
+    SemaObj->RISCV().DeclareRVVBuiltins = RISCVVecIntrinsicPragma[0];
----------------
topperc wrote:

assert that size is 3?

https://github.com/llvm/llvm-project/pull/171981
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