[clang] [llvm] [HLSL] Implement ddx/ddy_coarse intrinsics (PR #164831)

[Alexander Johnston via llvm-commits]

================
@@ -12,3 +12,5 @@ include "clang/Basic/BuiltinsSPIRVBase.td"
 def reflect : SPIRVBuiltin<"void(...)", [NoThrow, Const]>;
 def faceforward : SPIRVBuiltin<"void(...)", [NoThrow, Const, CustomTypeChecking]>;
 def refract : SPIRVBuiltin<"void(...)", [NoThrow, Const, CustomTypeChecking]>;
+def ddx_coarse : SPIRVBuiltin<"void(...)", [NoThrow, Const, CustomTypeChecking]>;
+def ddy_coarse : SPIRVBuiltin<"void(...)", [NoThrow, Const, CustomTypeChecking]>;
----------------
Alexander-Johnston wrote:

Reverted

https://github.com/llvm/llvm-project/pull/164831