ARROW-14283: [CI][C++] Use LLVM 12 on macOS GHA builds#11379

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pitrou wants to merge 2 commits intoapache:masterfrom

pitrou:ARROW-14283-mac-os-gha

Commits on Oct 11, 2021

ARROW-14283: [CI][C++] Disable Gandiva on macOS GHA builds
pitrou
committed

Commits on Oct 12, 2021

Use LLVM 12 on macOS as workaround
kou
committed