Han Shen b9d079d618 [clang][test] Refine clang machine-function-split tests.
This CL includes two changes:
1. moved clang backend-warnings test cases from Driver/ to CodeGen/.
2. removed multiple `cd "$(dirname "%t")"` and replaced with `-o %t`.

Reviewed By: maskray (Fangrui Song)
Differential Revision: https://reviews.llvm.org/D157565
2023-08-18 18:05:47 -07:00
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