[ptr-compr] Use branchful pointer decompression in generated code

Locally tested, octane results are the same or better when using
branchful decompression in generated code.

The biggest one is DeltaBlue in x64 which improves about 25%.
x64's EarleyBoyer is another important one with ~10% improvement.

Bug: v8:7703
Change-Id: Ie1edd6e216b307a1f5263b22472c0a64f76400fc
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1690955
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62577}

src/common/globals.h

@@ -240,7 +240,7 @@ using AtomicTagged_t = base::AtomicWord;
 // Defines whether the branchless or branchful implementation of pointer
 // decompression should be used.
 constexpr bool kUseBranchlessPtrDecompressionInRuntime = false;
-constexpr bool kUseBranchlessPtrDecompressionInGeneratedCode = true;
+constexpr bool kUseBranchlessPtrDecompressionInGeneratedCode = false;
 
 STATIC_ASSERT(kTaggedSize == (1 << kTaggedSizeLog2));
 STATIC_ASSERT((kTaggedSize == 8) == TAGGED_SIZE_8_BYTES);