Alexandre Ganea 68d7f06092 Clang] Fix expansion of response files in -Wp after integrated-cc1 change
After rGb4a99a061f517e60985667e39519f60186cbb469, passing a response file such as -Wp,@a.rsp wasn't working anymore because .rsp expansion happens inside clang's main() function.

This patch adds response file expansion in the -cc1 tool.

Differential Revision: https://reviews.llvm.org/D73120
2020-01-22 16:53:44 -05:00
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