[clang] [llvm] [clang][RISCV] Use macro to check if intrinsics are supported (PR #187197)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions c,cpp -- clang/test/Preprocessor/riscv-intrinsic-exts.c clang/lib/Basic/Targets/RISCV.cpp clang/utils/TableGen/RISCVVEmitter.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Basic/Targets/RISCV.cpp b/clang/lib/Basic/Targets/RISCV.cpp
index f59859862..569337206 100644
--- a/clang/lib/Basic/Targets/RISCV.cpp
+++ b/clang/lib/Basic/Targets/RISCV.cpp
@@ -197,8 +197,7 @@ namespace RVVAndes {
 #include "clang/Basic/riscv_andes_vector_builtins.inc"
 #undef GET_RISCVV_BUILTIN_STR_TABLE
 
-static constexpr std::array<Builtin::Info, NumRVVAndesBuiltins> BuiltinInfos =
-    {
+static constexpr std::array<Builtin::Info, NumRVVAndesBuiltins> BuiltinInfos = {
 #define GET_RISCVV_BUILTIN_INFOS
 #include "clang/Basic/riscv_andes_vector_builtins.inc"
 #undef GET_RISCVV_BUILTIN_INFOS
@@ -367,8 +366,10 @@ void RISCVTargetInfo::getTargetDefines(const LangOptions &Opts,
   DefineSuperExt("__riscv_v_intrinsic_", "zvksg", {"zvks", "zvkg"});
 
   // Scalar crypto composite extensions
-  DefineSuperExt("__riscv_intrinsic_", "zkn", {"zbkb", "zbkc", "zbkx", "zkne", "zknd", "zknh"});
-  DefineSuperExt("__riscv_intrinsic_", "zks", {"zbkb", "zbkc", "zbkx", "zksed", "zksh"});
+  DefineSuperExt("__riscv_intrinsic_", "zkn",
+                 {"zbkb", "zbkc", "zbkx", "zkne", "zknd", "zknh"});
+  DefineSuperExt("__riscv_intrinsic_", "zks",
+                 {"zbkb", "zbkc", "zbkx", "zksed", "zksh"});
 
   auto VScale = getVScaleRange(Opts, ArmStreamingKind::NotStreaming);
   if (VScale && VScale->first && VScale->first == VScale->second)

``````````

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https://github.com/llvm/llvm-project/pull/187197