[infra] create a builder for pointer compression without dchecks

{V8 Linux 64 - pointer compression} builder uploads dchecks enabled builds.

This CL creates a new builder that compiles V8 without dchecks enabled.

This CL uses the inverted naming predicate {without dchecks} to avoid renaming
the existing builder to {with dchecks} to avoid doing renames over multiple
repositories for a temporary builder that we'll remove after the ptr compression
merge to master.

R=sergiyb@chromium.org
CC=machenbach@chromium.org

Bug: v8:9345
Change-Id: I9e8cc1a9eb59325fd8eecc8fdcd2778b4da005c0
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1657922
Commit-Queue: Tamer Tas <tmrts@chromium.org>
Commit-Queue: Sergiy Belozorov <sergiyb@chromium.org>
Auto-Submit: Tamer Tas <tmrts@chromium.org>
Reviewed-by: Sergiy Belozorov <sergiyb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62140}

infra/mb/mb_config.pyl

@@ -95,6 +95,8 @@
       'V8 iOS - sim': 'release_x64_ios_simulator',
       'V8 Linux64 - debug - perfetto - builder': 'debug_x64_perfetto',
       'V8 Linux64 - pointer compression': 'release_x64_pointer_compression',
+      'V8 Linux64 - pointer compression without dchecks':
+          'release_x64_pointer_compression_without_dchecks',
       'V8 Linux64 - arm64 - sim - pointer compression - builder':
           'release_simulate_arm64_pointer_compression',
       'V8 Linux - noembed': 'release_x86_noembed',
@@ -458,6 +460,8 @@
     'release_x64_pointer_compression': [
       'release_bot', 'x64', 'dcheck_always_on', 'v8_enable_slow_dchecks',
       'v8_enable_pointer_compression'],
+    'release_x64_pointer_compression_without_dchecks': [
+      'release_bot', 'x64', 'v8_enable_pointer_compression'],
     'release_x64_trybot': [
       'release_trybot', 'x64'],
     'release_x64_test_features_trybot': [