Fix MSVC builds with is_debug=true

PDFium builds V8 with MSVC and is_debug=true (which is not a
configuration covered by the V8 bots). crrev.com/c/2690588 introduced a
DCHECK_EQ which triggers an MSVC compiler error due to comparing a bool
and a uint8_t value.

This change converts the uint8_t value into a bool using "!!", fixing
the MSVC error. This will unblock V8 rolls into PDFium.

Example build log:
https://logs.chromium.org/logs/pdfium/buildbucket/cr-buildbucket.appspot.com/8851041716432959712/+/steps/compile_with_ninja/0/stdout

Change-Id: I5c365696ead7958709df145ccc2e5f796dec80ff
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2806743
Auto-Submit: K. Moon <kmoon@chromium.org>
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#73797}

src/runtime/runtime-wasm.cc

@@ -567,7 +567,7 @@ RUNTIME_FUNCTION(Runtime_WasmDebugBreak) {
   DebugScope debug_scope(isolate->debug());
 
   // Check for instrumentation breakpoint.
-  DCHECK_EQ(script->break_on_entry(), instance->break_on_entry());
+  DCHECK_EQ(script->break_on_entry(), !!instance->break_on_entry());
   if (script->break_on_entry()) {
     MaybeHandle<FixedArray> maybe_on_entry_breakpoints =
         WasmScript::CheckBreakPoints(isolate, script,