The CL #35139 (https://codereview.chromium.org/1775323002) added V8_TARGET_ARCH_IA32 macro in
  src/globals.h.

  X87 is almost same as IA32, So It needs the V8_TARGET_ARCH_X87 macro in src/globals.h too.

BUG=

Review URL: https://codereview.chromium.org/1886233002

Cr-Commit-Position: refs/heads/master@{#35464}