Compile Vulkan library with Subzero in Chromium

This allows Chromium to use the SwiftShader Vulkan library
with the Subzero backend when available.

Bug: chromium:1060139
Change-Id: I444b3e6844c52781ada9f51c8ddb4e4d2ea6a6d4
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/42108
Presubmit-Ready: Alexis Hétu <sugoi@google.com>
Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>

src/Vulkan/BUILD.gn

diff --git a/src/Vulkan/BUILD.gn b/src/Vulkan/BUILD.gn
index b167c68..9ea2d28 100644
--- a/src/Vulkan/BUILD.gn
+++ b/src/Vulkan/BUILD.gn
@@ -175,7 +175,7 @@
     "../../third_party/marl:Marl",
     "../Device",
     "../Pipeline",
-    "../Reactor:swiftshader_llvm_reactor",
+    "../Reactor:swiftshader_reactor",
     "../System",
     "../WSI",
   ]