[gn] Fix no-inline config for V8

This restores the original gyp behavior. Blocks:
https://codereview.chromium.org/2334003005

BUG=chromium:474921
NOTRY=true

Review-Url: https://codereview.chromium.org/2344493002
Cr-Commit-Position: refs/heads/master@{#39414}

BUILD.gn

@@ -62,6 +62,9 @@ declare_args() {
   # tools/gen-postmortem-metadata.py for details.
   v8_postmortem_support = false
 
+  # Switches off inlining in V8.
+  v8_no_inline = false
+
   # Similar to vfp but on MIPS.
   v8_can_use_fpu_instructions = true
 
@@ -357,6 +360,13 @@ config("toolchain") {
   } else if (dcheck_always_on) {
     defines += [ "DEBUG" ]
   }
+
+  if (v8_no_inline) {
+    cflags += [
+      "-fno-inline-functions",
+      "-fno-inline",
+    ]
+  }
 }
 
 ###############################################################################

infra/mb/mb_config.pyl

@@ -595,9 +595,9 @@
       'gyp_defines': 'test_isolation_mode=prepare',
     },
 
-    # TODO(machenbach): Remove the symbolized config after the bots are  gone.
+    # TODO(machenbach): Remove the symbolized config after the bots are gone.
     'symbolized': {
-      'gn_args': 'symbolized=true',
+      'gn_args': 'v8_no_inline=true',
       'gyp_defines':
         'release_extra_cflags="-fno-inline-functions -fno-inline"',
     },