Reland "Merge more Kernel infrastructure from kernel_sdk SDK fork."

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 5055ecbb0445f5d053bc0bed7a5cb80ef099d941..a027a2e6150b25e0778b0dc9e779488b0401dfbd 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -29,6 +29,7 @@ group("runtime") {
     "runtime/bin:run_vm_tests",
     "runtime/bin:sample_extension",
     "runtime/bin:test_extension",
+    "runtime/vm:patched_sdk",
   ]
 }
 
@@ -36,6 +37,7 @@ group("runtime_precompiled") {
   deps = [
     "runtime/bin:dart_bootstrap($host_toolchain)",
     "runtime/bin:dart_precompiled_runtime",
+    "runtime/vm:patched_sdk",
   ]
 }
 
@@ -48,6 +50,7 @@ group("runtime_and_noopt") {
     "runtime/bin:run_vm_tests",
     "runtime/bin:sample_extension",
     "runtime/bin:test_extension",
+    "runtime/vm:patched_sdk",
   ]
 }