[msan] Reland: Increase k num stack origin descrs (limited to non-PowerPC) (#93117) The original pull request (https://github.com/llvm/llvm-project/pull/92838) was reverted due to a PowerPC buildbot breakage (https://github.com/llvm/llvm-project/commit/df626dd11c360c58eddae813ce6a0524d0a53696). This reland limits the scope of the change to non-PowerPC platforms. I am unaware of any PowerPC use cases that would benefit from a larger kNumStackOriginDescrs constant. Original CL description: This increases the constant size of kNumStackOriginDescrs to 4M (64GB of BSS across two arrays), which ought to be enough for anybody. This is the easier alternative suggested by eugenis@ in https://github.com/llvm/llvm-project/pull/92826.
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