Add some missing includes

Found by v8_check_header_includes=true use_custom_libcxx=false
is_clang=false

Bug: chromium:1298421
Change-Id: Ia4e40d1abcc7075d2487aa6487db871b5a75b5a1
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3478214Reviewed-by: Nico Hartmann <nicohartmann@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Hans Wennborg <hans@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79204}

src/base/safe_conversions_impl.h

@@ -12,6 +12,7 @@
 #ifndef V8_BASE_SAFE_CONVERSIONS_IMPL_H_
 #define V8_BASE_SAFE_CONVERSIONS_IMPL_H_
 
+#include <stddef.h>
 #include <stdint.h>
 
 #include <limits>

src/d8/cov.h

@@ -10,6 +10,7 @@
 // memory
 // https://clang.llvm.org/docs/SanitizerCoverage.html
 
+#include <cstdint>
 #include <vector>
 
 void sanitizer_cov_reset_edgeguards();

src/objects/swiss-hash-table-helpers.h

@@ -6,6 +6,7 @@
 // container, like SwissNameDictionary. Taken almost in verbatim from Abseil,
 // comments in this file indicate what is taken from what Abseil file.
 
+#include <climits>
 #include <cstdint>
 #include <type_traits>