Extract intruction pointer correctly for Windows ARM64

Bug: 893460
Change-Id: Ibbdf734e72c29c4779b6a701dceec1626056a9ba
Reviewed-on: https://chromium-review.googlesource.com/c/1393763
Reviewed-by: Joshua Peraza <jperaza@chromium.org>

src/client/windows/handler/exception_handler.cc

diff --git a/src/client/windows/handler/exception_handler.cc b/src/client/windows/handler/exception_handler.cc
index c369b65..ad45b20 100644
--- a/src/client/windows/handler/exception_handler.cc
+++ b/src/client/windows/handler/exception_handler.cc
@@ -976,7 +976,9 @@
 #if defined(_M_IX86)
           exinfo->ContextRecord->Eip;
 #elif defined(_M_AMD64)
-        exinfo->ContextRecord->Rip;
+          exinfo->ContextRecord->Rip;
+#elif defined(_M_ARM64)
+          exinfo->ContextRecord->Pc;
 #else
 #error Unsupported platform
 #endif