[build] Remove MB configs for x87

The bots were deleted on the infra side.

NOTRY=true
TBR=jkummerow@chromium.org

Bug: v8:6550
Change-Id: I2c054c04535d218a540e5d22ca2770627cafded4
Reviewed-on: https://chromium-review.googlesource.com/559340
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46413}

infra/mb/mb_config.pyl

@@ -145,8 +145,6 @@
       # S390.
       'V8 Linux - s390 - sim': 'gyp_release_simulate_s390',
       'V8 Linux - s390x - sim': 'gyp_release_simulate_s390x',
-      # X87.
-      'V8 Linux - x87 - nosnap - debug builder': 'gyp_debug_simulate_x87',
     },
     'client.v8.branches': {
       'V8 Linux - beta branch': 'gn_release_x86',
@@ -481,10 +479,6 @@
       'gn', 'release_bot', 'x86', 'swarming', 'dcheck_always_on',
       'v8_enable_slow_dchecks', 'v8_verify_csa'],
 
-    # Gyp debug configs for simulators.
-    'gyp_debug_simulate_x87': [
-      'gyp', 'debug_bot_static', 'simulate_x87', 'gcc', 'swarming'],
-
     # Gyp release configs for mips.
     'gyp_release_mips_no_snap_no_i18n': [
       'gyp', 'release', 'mips', 'crosscompile', 'static', 'v8_no_i18n',
@@ -567,12 +561,6 @@
         'v8_optimized_debug'],
     },
 
-    'debug_bot_static': {
-      'mixins': [
-        'debug', 'static', 'goma', 'v8_enable_slow_dchecks',
-        'v8_optimized_debug'],
-    },
-
     'debug_trybot': {
       'mixins': ['debug_bot', 'minimal_symbols'],
     },
@@ -691,11 +679,6 @@
       'gyp_defines': 'target_arch=x64 v8_target_arch=s390x',
     },
 
-    'simulate_x87': {
-      'gn_args': 'target_cpu="x86" v8_target_cpu="x87"',
-      'gyp_defines': 'target_arch=ia32 v8_target_arch=x87',
-    },
-
     'static': {
       'gn_args': 'is_component_build=false',
       'gyp_defines': 'component=static_library',