[ptr-compr] Fix MSVC build

... which complained about truncating uintptr_t constant to uint32_t.

Bug: v8:7703
Change-Id: I6fae2bf1e5de79e6131479b84a8d8aa5b9de909f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1508672Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60100}

src/string-case.cc

@@ -17,6 +17,10 @@ namespace internal {
 // string data depends on kTaggedSize so we define word_t via Tagged_t.
 using word_t = std::make_unsigned<Tagged_t>::type;
 
+const word_t kWordTAllBitsSet = std::numeric_limits<word_t>::max();
+const word_t kOneInEveryByte = kWordTAllBitsSet / 0xFF;
+const word_t kAsciiMask = kOneInEveryByte << 7;
+
 #ifdef DEBUG
 bool CheckFastAsciiConvert(char* dst, const char* src, int length, bool changed,
                            bool is_to_lower) {
@@ -36,9 +40,6 @@ bool CheckFastAsciiConvert(char* dst, const char* src, int length, bool changed,
 }
 #endif
 
-const word_t kOneInEveryByte = static_cast<word_t>(kUintptrAllBitsSet) / 0xFF;
-const word_t kAsciiMask = kOneInEveryByte << 7;
-
 // Given a word and two range boundaries returns a word with high bit
 // set in every byte iff the corresponding input byte was strictly in
 // the range (m, n). All the other bits in the result are cleared.