Fix - x86_64 hard coded in Target/CMakeLists.txt

Update to lldb version causes build failure on aarch64 machines due to hard coding of x86_64 hard coded in source/Target/CMakeLists.txt
lldb - swift-lldb PR #962

swift-for-tensorflow-patches/lldb-reflection-fix.patch

@@ -0,0 +1,26 @@
+From 2677b85040b939353b8b529a4a0b1cfdfad004ed Mon Sep 17 00:00:00 2001
+From: Michael Munday <mike.munday@ibm.com>
+Date: Mon, 8 Oct 2018 09:48:40 -0400
+Subject: [PATCH] [CMake] Fix reflection lib name on non-x86_64 Linux
+ platforms.
+
+Remove the hardcoded instance of 'x86_64' and query the platform's
+processor name instead.
+---
+ source/Target/CMakeLists.txt | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/source/Target/CMakeLists.txt b/source/Target/CMakeLists.txt
+index f6bbd6f8ce8..711b4a48df7 100644
+--- a/source/Target/CMakeLists.txt
++++ b/source/Target/CMakeLists.txt
+@@ -3,7 +3,8 @@ include_directories(../Plugins/Process/Utility)
+ set(REFLECTION_LIB "swiftReflection")
+
+ if(CMAKE_SYSTEM_NAME MATCHES "Linux")
+-    set(REFLECTION_LIB "swiftReflection-linux-x86_64")
++    # CMAKE_SYSTEM_PROCESSOR is equivalent to `uname -p` on Linux.
++    set(REFLECTION_LIB "swiftReflection-linux-${CMAKE_SYSTEM_PROCESSOR}")
+ endif()
+
+ if(CMAKE_SYSTEM_NAME MATCHES "Darwin")