[PATCH 20/22] perf test: Enforce LLVM test, add kbuild test

This patch enforces existing LLVM test, makes it compile more than one BPF source file. The compiled results are stored, can be used for other testcases. Except the first testcase (named LLVM_TESTCASE_BASE), failures of other test cases are not considered as failure of the whole test. Adds a

[PATCH 20/22] perf test: Enforce LLVM test, add kbuild test

This patch enforces existing LLVM test, makes it compile more than one BPF source file. The compiled results are stored, can be used for other testcases. Except the first testcase (named LLVM_TESTCASE_BASE), failures of other test cases are not considered as failure of the whole test. Adds a