Remove dead code. NFC.

This interface was added 2 years ago but users never developed.

llvm-svn: 223368
diff --git a/llvm/lib/Support/Unix/Memory.inc b/llvm/lib/Support/Unix/Memory.inc
index c9d89a8..7ccde46 100644
--- a/llvm/lib/Support/Unix/Memory.inc
+++ b/llvm/lib/Support/Unix/Memory.inc
@@ -88,7 +88,7 @@
   if (NumBytes == 0)
     return MemoryBlock();
 
-  static const size_t PageSize = process::get_self()->page_size();
+  static const size_t PageSize = Process::getPageSize();
   const size_t NumPages = (NumBytes+PageSize-1)/PageSize;
 
   int fd = -1;
@@ -181,7 +181,7 @@
                     std::string *ErrMsg) {
   if (NumBytes == 0) return MemoryBlock();
 
-  size_t PageSize = process::get_self()->page_size();
+  size_t PageSize = Process::getPageSize();
   size_t NumPages = (NumBytes+PageSize-1)/PageSize;
 
   int fd = -1;