Update LLVM for rebase to r212749.

Includes a cherry-pick of:
r212948 - fixes a small issue with atomic calls

Change-Id: Ib97bd980b59f18142a69506400911a6009d9df18

1 files changed, 9 insertions, 2 deletions

diff --git a/include/llvm/Support/Process.h b/include/llvm/Support/Process.h
index 7f6441ea20..30973de3aa 100644
--- a/include/llvm/Support/Process.h
+++ b/include/llvm/Support/Process.h
@@ -31,7 +31,7 @@
 #include "llvm/Support/Allocator.h"
 #include "llvm/Support/DataTypes.h"
 #include "llvm/Support/TimeValue.h"
-#include "llvm/Support/system_error.h"
+#include <system_error>
 
 namespace llvm {
 class StringRef;
@@ -171,10 +171,17 @@ public:
   // string. \arg Name is assumed to be in UTF-8 encoding too.
   static Optional<std::string> GetEnv(StringRef name);
 
+  /// This function searches for an existing file in the list of directories
+  /// in a PATH like environment variable, and returns the first file found,
+  /// according to the order of the entries in the PATH like environment
+  /// variable.
+  static Optional<std::string> FindInEnvPath(const std::string& EnvName,
+                                             const std::string& FileName);
+
   /// This function returns a SmallVector containing the arguments passed from
   /// the operating system to the program.  This function expects to be handed
   /// the vector passed in from main.
-  static error_code
+  static std::error_code
   GetArgumentVector(SmallVectorImpl<const char *> &Args,
                     ArrayRef<const char *> ArgsFromMain,
                     SpecificBumpPtrAllocator<char> &ArgAllocator);