[clang] [clang][NFCI] Fix getGridValues for unsupported targets (PR #131023)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Nick Sarnie (sarnex)

<details>
<summary>Changes</summary>

I broke this in https://github.com/llvm/llvm-project/commit/f3cd2238383f695c719e7eab6aebec828781ec91, I should have added this to the `SPIRV64` subclass, but I accidentally added it to base `TargetInfo`.

---
Full diff: https://github.com/llvm/llvm-project/pull/131023.diff


2 Files Affected:

- (modified) clang/include/clang/Basic/TargetInfo.h (+1-1) 
- (modified) clang/lib/Basic/Targets/SPIR.h (+4) 


``````````diff
diff --git a/clang/include/clang/Basic/TargetInfo.h b/clang/include/clang/Basic/TargetInfo.h
index d136b459e9cd4..497d68779b92b 100644
--- a/clang/include/clang/Basic/TargetInfo.h
+++ b/clang/include/clang/Basic/TargetInfo.h
@@ -1675,7 +1675,7 @@ class TargetInfo : public TransferrableTargetInfo,
   // access target-specific GPU grid values that must be consistent between
   // host RTL (plugin), deviceRTL and clang.
   virtual const llvm::omp::GV &getGridValue() const {
-    return llvm::omp::SPIRVGridValues;
+    llvm_unreachable("getGridValue not implemented on this target");
   }
 
   /// Retrieve the name of the platform as it is used in the
diff --git a/clang/lib/Basic/Targets/SPIR.h b/clang/lib/Basic/Targets/SPIR.h
index 610efa1fe00d9..78505d66d6f2f 100644
--- a/clang/lib/Basic/Targets/SPIR.h
+++ b/clang/lib/Basic/Targets/SPIR.h
@@ -370,6 +370,10 @@ class LLVM_LIBRARY_VISIBILITY SPIRV64TargetInfo : public BaseSPIRVTargetInfo {
 
   void getTargetDefines(const LangOptions &Opts,
                         MacroBuilder &Builder) const override;
+
+  const llvm::omp::GV &getGridValue() const override {
+    return llvm::omp::SPIRVGridValues;
+  }
 };
 
 class LLVM_LIBRARY_VISIBILITY SPIRV64AMDGCNTargetInfo final

``````````

</details>


https://github.com/llvm/llvm-project/pull/131023