selftest: Print stderr output upon llvm-mc failure #120
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Without stderr from `llvm-mc`, it's difficult to debug the issue. This commit modifies the call to `llvm-mc` so that the error output is printed is an exception is thrown while running `llvm-mc`.
This commit hoists out the common code between local and global selftest into a helper class SelfTest.
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Without stderr from
llvm-mc, it's difficult to debug the issue. This commit modifies the call tollvm-mcso that the error output is printed is an exception is thrown while runningllvm-mc.