Update clang to r339409.

Change-Id: I800772d2d838223be1f6b40d490c4591b937fca2
diff --git a/linux-x64/clang/include/llvm-c/lto.h b/linux-x64/clang/include/llvm-c/lto.h
index 65d172d..1acd610 100644
--- a/linux-x64/clang/include/llvm-c/lto.h
+++ b/linux-x64/clang/include/llvm-c/lto.h
@@ -190,7 +190,7 @@
                                         const char *path);
 
 /**
- * \brief Loads an object file in its own context.
+ * Loads an object file in its own context.
  *
  * Loads an object file in its own LLVMContext.  This function call is
  * thread-safe.  However, modules created this way should not be merged into an
@@ -205,7 +205,7 @@
                                    const char *path);
 
 /**
- * \brief Loads an object file in the codegen context.
+ * Loads an object file in the codegen context.
  *
  * Loads an object file into the same context as \c cg.  The module is safe to
  * add using \a lto_codegen_add_module().
@@ -345,7 +345,7 @@
 lto_codegen_create(void);
 
 /**
- * \brief Instantiate a code generator in its own context.
+ * Instantiate a code generator in its own context.
  *
  * Instantiates a code generator in its own context.  Modules added via \a
  * lto_codegen_add_module() must have all been created in the same context,
@@ -539,7 +539,7 @@
                                    lto_bool_t ShouldInternalize);
 
 /**
- * \brief Set whether to embed uselists in bitcode.
+ * Set whether to embed uselists in bitcode.
  *
  * Sets whether \a lto_codegen_write_merged_modules() should embed uselists in
  * output bitcode.  This should be turned on for all -save-temps output.