Move some compiler intrinsic #defines to base/.

base/compiler_specific.h

Index: base/compiler_specific.h
diff --git a/base/compiler_specific.h b/base/compiler_specific.h
index 0dbc3ae576688908b41a1b5921c744a71f5ada4c..996db0e5a70e47190a58bd6a34e1f26dcb572b13 100644
--- a/base/compiler_specific.h
+++ b/base/compiler_specific.h
@@ -100,6 +100,17 @@
 #define NOINLINE
 #endif
 
+// For compatibility with callers in Blink:
+#define NEVER_INLINE NOINLINE

[dcheng, 2016/11/07 20:43:10]

Btw, maybe a TODO here for eventual convergence. I would probably move this
#define into Blink actually (so that stuff outside Blink doesn't start depending
on the alias)

I guess we'll need to change PA when we move it out, but that doesn't seem too
bad.

[palmer, 2016/11/07 21:54:14]

Done.

+
+#if COMPILER_GCC && defined(NDEBUG)
+#define ALWAYS_INLINE inline __attribute__((__always_inline__))
+#elif COMPILER_MSVC && defined(NDEBUG)
+#define ALWAYS_INLINE __forceinline
+#else
+#define ALWAYS_INLINE inline
+#endif
+
 // Specify memory alignment for structs, classes, etc.
 // Use like:
 //   class ALIGNAS(16) MyClass { ... }
@@ -196,6 +207,14 @@
 #endif  // defined(COMPILER_GCC)
 #endif  // !defined(UNLIKELY)
 
+#if !defined(LIKELY)
+#if defined(COMPILER_GCC)
+#define LIKELY(x) __builtin_expect((x), 1)
+#else
+#define LIKELY(x) (x)
+#endif  // defined(COMPILER_GCC)
+#endif  // !defined(LIKELY)
+
 // Compiler feature-detection.
 // clang.llvm.org/docs/LanguageExtensions.html#has-feature-and-has-extension
 #if defined(__has_feature)