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This change is the second of 3 patches to add support for specifying the profile output from the command line via -fprofile-instr-generate=<path>, where the specified output path/file will be overridden by the LLVM_PROFILE_FILE environment variable. This patch adds the necessary support to the llvm instrumenter, specifically a new member of GCOVOptions for clang to save the specified filename, and support for calling the new compiler-rt interface from __llvm_profile_init. Patch by Teresa Johnson. Thanks! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236288 91177308-0d34-0410-b5e6-96231b3b80d8
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