[AMDGPU][test] fix the error case in update_mc_test_check script (#112731) update_mc_test_check script handle the "error case testline" wrong in three cases: 1. when user select "--llvm-mc-binary" with a path, the script does not add "not" on top of the "--llvm-mc-binary" and thus getting non-zero exit code and failed. 2. When "not" is presented in runline while not all testlines are expected to fail, the script need to check if the "not" is needed when it execute llvm-mc line by line. Otherwise the script will fail on testline which is passing. 3. When there are multiple runlines, the error checkline need to use correct line offset for "[[LINE-X]]" This patch solve these three issues
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