[android] Add support for building the toolchain for ARMv7 #34160
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I just shipped a Swift toolchain for Android ARMv7, termux/termux-packages#5843, and these are the changes I had to make. @uraimo and I may be the only people building the Swift compiler for a 32-bit platform anymore, as the ClangImporter static_cast will be needed for all 32-bit platforms.