Fix the v8 snapshots in the GN mipsel, mips64el builds.

build/toolchain/linux/BUILD.gn

Index: build/toolchain/linux/BUILD.gn
diff --git a/build/toolchain/linux/BUILD.gn b/build/toolchain/linux/BUILD.gn
index 51e26cfce4d635a1317ee029503ccb2d44042b6a..c7a879465f8f284645fa1a2dc17c89f873022246 100644
--- a/build/toolchain/linux/BUILD.gn
+++ b/build/toolchain/linux/BUILD.gn
@@ -44,6 +44,12 @@ clang_toolchain("clang_x86_v8_arm") {
   toolchain_os = "linux"
 }
 
+clang_toolchain("clang_x86_v8_mipsel") {
+  toolchain_cpu = "x86"
+  v8_toolchain_cpu = "mipsel"
+  toolchain_os = "linux"
+}
+
 gcc_toolchain("x86") {
   cc = "gcc"
   cxx = "g++"
@@ -69,6 +75,12 @@ clang_toolchain("clang_x64_v8_arm64") {
   toolchain_os = "linux"
 }
 
+clang_toolchain("clang_x64_v8_mips64el") {
+  toolchain_cpu = "x64"
+  v8_toolchain_cpu = "mips64el"
+  toolchain_os = "linux"
+}
+
 gcc_toolchain("x64") {
   cc = "gcc"
   cxx = "g++"