Changes

Summary

InstCombiner.h - remove unnecessary KnownBits forward declaration. NFCI. (details)
Revert "Revert "[gn build] (manually) port 9b6765e784b3" anf follow-ups" (details)
[gn build] (manually) merge 2124ca1d5 (details)
[gn build] Port 2124ca1d5cb (details)
lld/mach-o: Make tool scripts from 2124ca1d5cb py2.7-compatible (details)
Change name of Record::TheInit to CorrespondingDefInit to make code clearer. (details)

Commit 0c20d753d5fbacc162ce77271e616ad107956bf7 by llvm-dev InstCombiner.h - remove unnecessary KnownBits forward declaration. NFCI. We already include KnownBits.h
	llvm/include/llvm/Transforms/InstCombine/InstCombiner.h
Commit 3618ac203f17316401a48b5810b3b9c5ac417f2a by thakis Revert "Revert "[gn build] (manually) port 9b6765e784b3" anf follow-ups" This reverts commit 90fffdd0f705bfb480810cef087305567dc4f6cf. The original change relanded.
	llvm/utils/gn/secondary/clang-tools-extra/clangd/BUILD.gn
	llvm/utils/gn/secondary/clang-tools-extra/clangd/quality/gen_decision_forest.gni
	llvm/utils/gn/secondary/clang-tools-extra/clangd/unittests/BUILD.gn
Commit ec9fb73277444ccc292d3662440ce44254b485c2 by thakis [gn build] (manually) merge 2124ca1d5
	llvm/utils/gn/secondary/lld/MachO/BUILD.gn
Commit 70409b2897f2c894e389c5ab590931f983d3e6d7 by thakis [gn build] Port 2124ca1d5cb
	llvm/utils/gn/secondary/lld/MachO/BUILD.gn
Commit e22a4fd59de668af1cb943e23a6f4bfc93090e0f by thakis lld/mach-o: Make tool scripts from 2124ca1d5cb py2.7-compatible
	lld/test/MachO/tools/generate-cfi-funcs.py
	lld/test/MachO/tools/validate-unwind-info.py
Commit 04cebd900fde2c10d31a149895ed2495ff0994f7 by paul Change name of Record::TheInit to CorrespondingDefInit to make code clearer. Differential Revision: https://reviews.llvm.org/D87919
	llvm/include/llvm/TableGen/Record.h
	llvm/lib/TableGen/Record.cpp