[csa] Fix for debug build in MSVC

The preprocessor of MSVC works differently for empty __VA_ARGS__.
Another hack is needed to make this compile in both MSVC and clang.

R=tebbi@chromium.org

Bug: v8:9555
Change-Id: Ie8f2e1ed302730419dae95e49ab0cca35a4a8131
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1720669Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62952}

src/codegen/code-stub-assembler.h

@@ -120,8 +120,10 @@ enum class PrimitiveType { kBoolean, kNumber, kString, kSymbol };
 // clang-format on
 #define SWITCH_CSA_ASSERT_ARGS(dummy, a, b, FUNC, ...) FUNC(a, b)
 #define CSA_ASSERT_ARGS(...)                                        \
-  SWITCH_CSA_ASSERT_ARGS(dummy, ##__VA_ARGS__, CSA_ASSERT_2_ARGS, \
-                         CSA_ASSERT_1_ARG, CSA_ASSERT_0_ARGS)
+  CALL(SWITCH_CSA_ASSERT_ARGS, (, ##__VA_ARGS__, CSA_ASSERT_2_ARGS, \
+                                CSA_ASSERT_1_ARG, CSA_ASSERT_0_ARGS))
+// Workaround for MSVC to skip comma in empty __VA_ARGS__.
+#define CALL(x, y) x y
 
 // CSA_ASSERT(csa, <condition>, <extra values to print...>)