[hexagon] Add {con,de}structive interference size defn

This support was originally added in 72c373b ([C++17] Support
__GCC_[CON|DE]STRUCTIVE_SIZE (#89446), 2024-04-26).  We're overriding
the values for Hexagon here.

Signed-off-by: Brian Cain <[email protected]>

Author: androm3da

clang/lib/Basic/Targets/Hexagon.h

@@ -139,6 +139,10 @@ class LLVM_LIBRARY_VISIBILITY HexagonTargetInfo : public TargetInfo {
   }
 
   bool hasBitIntType() const override { return true; }
+
+  std::pair<unsigned, unsigned> hardwareInterferenceSizes() const override {
+    return std::make_pair(32, 32);
+  }
 };
 } // namespace targets
 } // namespace clang

clang/test/Preprocessor/hexagon-predefines.c

@@ -169,3 +169,12 @@
 // CHECK-ATOMIC: #define __CLANG_ATOMIC_POINTER_LOCK_FREE 2
 // CHECK-ATOMIC: #define __CLANG_ATOMIC_SHORT_LOCK_FREE 2
 // CHECK-ATOMIC: #define __CLANG_ATOMIC_WCHAR_T_LOCK_FREE 2
+
+// RUN: %clang_cc1 -E -dM -triple hexagon-unknown-linux-musl \
+// RUN: -target-cpu hexagonv67 | FileCheck \
+// RUN: %s -check-prefix CHECK-INTERFERENCE
+// RUN: %clang_cc1 -E -dM -triple hexagon-unknown-none-elf \
+// RUN: -target-cpu hexagonv67 | FileCheck \
+// RUN: %s -check-prefix CHECK-INTERFERENCE
+// CHECK-INTERFERENCE: #define __GCC_CONSTRUCTIVE_SIZE 32
+// CHECK-INTERFERENCE: #define __GCC_DESTRUCTIVE_SIZE 32