[builtins] Declare builtin symbols as globals

Follow-up to 17ad3ae4.

Another try at exposing embedded builtin symbols on chromecrash.

Bug: v8:6666, v8:7722
Change-Id: Ie715251797134be0618c0bc496ec10958f7545c3
Reviewed-on: https://chromium-review.googlesource.com/1174112Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55108}

src/snapshot/macros.h

@@ -39,7 +39,7 @@
 #if defined(V8_TARGET_ARCH_MIPS) || defined(V8_TARGET_ARCH_MIPS64)
 #define V8_ASM_DECLARE(NAME) ".global " V8_ASM_MANGLE_LABEL NAME "\n"
 #else
-#define V8_ASM_DECLARE(NAME) ".local " V8_ASM_MANGLE_LABEL NAME "\n"
+#define V8_ASM_DECLARE(NAME) ".global " V8_ASM_MANGLE_LABEL NAME "\n"
 #endif
 #endif