Add more value barriers to avoid compiler induced side channels #6170

Job	Run time
Windows (shared, x86_64, windows-2022)	2m 40s
Windows (static, x86_64, windows-2022)	2m 44s
Analysis (coverage, gcc, ubuntu-24.04)	2m 57s
Windows (amalgamation, x86_64, windows-2022)	2m 37s
Analysis (sanitizer, clang, ubuntu-24.04)	2m 14s
Windows (shared, x86, windows-2022)	2m 42s
Analysis (valgrind, clang, ubuntu-24.04)	29s
Analysis (fuzzers, gcc, ubuntu-24.04)	56s
Analysis (lint, gcc, ubuntu-24.04)	1m 9s
Clang Tidy	37s
Linux (gcc, shared)	1m 11s
Analysis (format, gcc, ubuntu-24.04)	27s
Linux (gcc, amalgamation)	1m 6s
Analysis (limbo, gcc, ubuntu-24.04)	23s
Linux (gcc, static)	56s
macOS (shared, xcode, macos-13)	1m 44s
Linux (clang, shared)	1m 4s
macOS (amalgamation, xcode, macos-13)	1m 52s
Special (examples, gcc, ubuntu-24.04)	36s
macOS (shared, xcode, macos-14)	1m 29s
macOS (amalgamation, xcode, macos-14)	1m 10s
Cross (cross-i386, gcc, ubuntu-22.04)	49s
Special (minimized, gcc, ubuntu-24.04)	26s
Cross (cross-arm32, gcc, ubuntu-24.04)	1m 0s
Special (bsi, gcc, ubuntu-24.04)	1m 5s
Cross (cross-arm64, gcc, ubuntu-24.04)	34s
Special (docs, gcc, ubuntu-24.04)	1m 13s
Cross (cross-ppc64, gcc, ubuntu-24.04)	30s
Special (no_pcurves, gcc, ubuntu-24.04)	27s
Cross (cross-mips64, gcc, ubuntu-24.04)	38s
Cross (cross-android-arm64, clang, ubuntu-24.04)	42s
Cross (static, gcc, windows-2022, make)	1m 20s
Cross (cross-ios-arm64, xcode, macos-13)	45s
	40m 32s

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