[codex] Provide ARM64 MinGW powl compatibility support - #27323
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Why
Windows ARM64 uses 64-bit
long double, but the LLVM MinGW Bazel configuration omits the upstreampowlcompatibility source and does not link themingwexarchive that owns it. Cross-linking the release binary therefore fails with an unresolvedpowlsymbol.What changed
Patch the LLVM module to compile
math/arm-common/powl.cinto the ARM64 MinGW extension sources and add-lmingwexto the Windows toolchain defaults.Validation
just bazel-lock-checkStack: 3 of 6. Depends on #27322.