[jumbo] add namespaces to avoid CreateDescriptorForStackArguments collision

Bug: chromium:798964
Change-Id: If88093cc1f1c1793be570f37604a03d427821821
Reviewed-on: https://chromium-review.googlesource.com/868159Reviewed-by: Ben Titzer <titzer@chromium.org>
Commit-Queue: Mostyn Bramley-Moore <mostynb@vewd.com>
Cr-Commit-Position: refs/heads/master@{#50630}

test/cctest/compiler/test-run-retpoline.cc

@@ -12,6 +12,7 @@
 namespace v8 {
 namespace internal {
 namespace compiler {
+namespace test_run_retpoline {
 
 #define __ assembler.
 
@@ -201,6 +202,7 @@ TEST(RetpolineEvenOddTail) {
   TestHelper(2, 3, true);
 }
 
+}  // namespace test_run_retpoline
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8

test/cctest/compiler/test-run-tail-calls.cc

@@ -13,6 +13,7 @@
 namespace v8 {
 namespace internal {
 namespace compiler {
+namespace test_run_tail_calls {
 
 #define __ assembler.
 
@@ -164,6 +165,7 @@ TEST(FuzzStackParamCount) {
   }
 }
 
+}  // namespace test_run_tail_calls
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8