Reactor: loongarch64 is not supported in subzero.

Bug: swiftshader:178
Change-Id: I37f36a0c357da60a55bb2123aedac096bdfffe55
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/73288
Reviewed-by: Geoff Lang <geofflang@google.com>
Kokoro-Result: kokoro <noreply+kokoro@google.com>
Tested-by: Ben Clayton <bclayton@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
diff --git a/src/Reactor/reactor.gni b/src/Reactor/reactor.gni
index 04fad6f..51cb8fb 100644
--- a/src/Reactor/reactor.gni
+++ b/src/Reactor/reactor.gni
@@ -9,8 +9,8 @@
 import("//build_overrides/build.gni")
 
 declare_args() {
-  # Subzero doesn't support ARM64, MIPS64, PPC64, and RISCV64 (only x86 and ARMv7a).
-  supports_subzero = current_cpu != "arm64" && current_cpu != "mips64el" && current_cpu != "ppc64" && current_cpu != "riscv64"
+  # Subzero doesn't support ARM64, LOONGARCH64, MIPS64, PPC64, and RISCV64 (only x86 and ARMv7a).
+  supports_subzero = current_cpu != "arm64" && current_cpu != "mips64el" && current_cpu != "ppc64" && current_cpu != "riscv64" && current_cpu != "loong64"
 }
 
 declare_args() {