[lldb][test] Fix toolchain-msvc.test for native ARM64 MSVC environment (#171797) This patch fixes toolchain-msvc.test on Windows ARM64 hosts running under native ARM64 environment via vcvarsarm64.bat. Our lab buildbot recently switched from using cross vcvarsamd64_arm64.bat environment to native vcvarsarm64.bat. This patch updates FileCheck patterns to also allow HostARM64 and arm64 PATH entries. Changes: -> Extend host regex to match HostARM64 (case-insensitive) -> Allow arm64 in PATH tail. -> Apply same fix in both 32-bit and 64-bit sections.
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