Introduce -Zdisable-incr-comp-backend-caching#157435
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This disables caching of compiled objects by the codegen backend during incremental compilation. This is useful for iterating on a codegen backend without having to run the entire rustc frontend from scratch every time when recompiling the standard library. Currently cg_clif has the CG_CLIF_DISABLE_INCR_CACHE env var that does this, but once cg_clif switches to the codegen coordinator of cg_ssa, it will no longer be possible for cg_clif to implement this. It has to be implemented in cg_ssa.
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lqd
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This disables caching of compiled objects by the codegen backend during incremental compilation. This is useful for iterating on a codegen backend without having to run the entire rustc frontend from scratch every time when recompiling the standard library. Currently cg_clif has the CG_CLIF_DISABLE_INCR_CACHE env var that does this, but once cg_clif switches to the codegen coordinator of cg_ssa, it will no longer be possible for cg_clif to implement this. It has to be implemented in cg_ssa.