Fix SmartOS compilation errors

Change-Id: I12f67d79c11a209b02262c282a27cc7ef6afc14b
Reviewed-on: https://chromium-review.googlesource.com/806774Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49983}

src/base/platform/platform-posix.cc

@@ -63,6 +63,14 @@
 #define MAP_ANONYMOUS MAP_ANON
 #endif
 
+#if defined(V8_OS_SOLARIS)
+#if (defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE > 2) || defined(__EXTENSIONS__)
+extern "C" int madvise(caddr_t, size_t, int);
+#else
+extern int madvise(caddr_t, size_t, int);
+#endif
+#endif
+
 #ifndef MADV_FREE
 #define MADV_FREE MADV_DONTNEED
 #endif
@@ -137,7 +145,7 @@ int ReclaimInaccessibleMemory(void* address, size_t size) {
   // marks the pages with the reusable bit, which allows both Activity Monitor
   // and memory-infra to correctly track the pages.
   int ret = madvise(address, size, MADV_FREE_REUSABLE);
-#elif defined(_AIX)
+#elif defined(_AIX) || defined(V8_OS_SOLARIS)
   int ret = madvise(reinterpret_cast<caddr_t>(address), size, MADV_FREE);
 #else
   int ret = madvise(address, size, MADV_FREE);
@@ -146,7 +154,7 @@ int ReclaimInaccessibleMemory(void* address, size_t size) {
     // MADV_FREE only works on Linux 4.5+ . If request failed, retry with older
     // MADV_DONTNEED . Note that MADV_FREE being defined at compile time doesn't
     // imply runtime support.
-#if defined(_AIX)
+#if defined(_AIX) || defined(V8_OS_SOLARIS)
     ret = madvise(reinterpret_cast<caddr_t>(address), size, MADV_DONTNEED);
 #else
     ret = madvise(address, size, MADV_DONTNEED);