Configure ABSL_CACHE_ALIGNED for clang-like and MSVC toolchains.

PiperOrigin-RevId: 479614832
Change-Id: I440d145172c93cc4043aeda36898877a331ed5ff

absl/base/optimization.h

@@ -91,6 +91,7 @@
 #define ABSL_CACHELINE_SIZE 64
 #endif
 #endif
+#endif
 
 #ifndef ABSL_CACHELINE_SIZE
 // A reasonable default guess.  Note that overestimates tend to waste more
@@ -141,12 +142,11 @@
 //    the generated machine code.
 // 3) Prefer applying this attribute to individual variables. Avoid
 //    applying it to types. This tends to localize the effect.
+#if defined(__clang__) || defined(__GNUC__)
 #define ABSL_CACHELINE_ALIGNED __attribute__((aligned(ABSL_CACHELINE_SIZE)))
 #elif defined(_MSC_VER)
-#define ABSL_CACHELINE_SIZE 64
 #define ABSL_CACHELINE_ALIGNED __declspec(align(ABSL_CACHELINE_SIZE))
 #else
-#define ABSL_CACHELINE_SIZE 64
 #define ABSL_CACHELINE_ALIGNED
 #endif