[profile] Add %t LLVM_PROFILE_FILE option to substitute $TMPDIR #1855
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Add support for expanding the %t filename specifier in LLVM_PROFILE_FILE to the TMPDIR environment variable. This is supported on all platforms. On Darwin, TMPDIR is used to specify a temporary application-specific scratch directory. When testing apps on remote devices, it can be challenging for the host device to determine the correct TMPDIR, so it's helpful to have the runtime do this work. rdar://68524185 Differential Revision: https://reviews.llvm.org/D87332 (cherry picked from commit 62c3727)
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