[clang] [RISCV][clang] Optimize memory usage of intrinsic lookup table (PR #77487)

[Craig Topper via cfe-commits]

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@@ -463,7 +464,7 @@ void RISCVIntrinsicManagerImpl::CreateRVVIntrinsicDecl(LookupResult &LR,
 bool RISCVIntrinsicManagerImpl::CreateIntrinsicIfFound(LookupResult &LR,
                                                        IdentifierInfo *II,
                                                        Preprocessor &PP) {
-  StringRef Name = II->getName();
+  StringRef Name = II->getName().substr(8);
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topperc wrote:

Add an assert that the string starts with `__riscv`

https://github.com/llvm/llvm-project/pull/77487