[clang] [llvm] [MC] Make UseAssemblerInfoForParsing mostly true (PR #91082)

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gulfemsavrun wrote:

> @gulfemsavrun Commit [245491a](https://github.com/llvm/llvm-project/commit/245491a9f384e4c53421196533c2a2b693efaf8d) (`[MC] Disable MCAssembler based constant folding for DwarfDebug`; independent of this patch) should have fixed the compile time regression. Might be worth testing the commit before and at [245491a](https://github.com/llvm/llvm-project/commit/245491a9f384e4c53421196533c2a2b693efaf8d) to see the time decrease.
@MaskRay I already checked with that patch, and we still have the same issue. We see this issue in llvm ToT. For example, this is a run from today:
https://luci-milo.appspot.com/ui/p/fuchsia/builders/prod/clang-mac-x64/b8746512510687347537/overview



https://github.com/llvm/llvm-project/pull/91082