BPF: backport 4 TTI cost function related commits

[yonghong-song]

Bugzilla Link	49390
Resolution	FIXED
Resolved on	May 03, 2021 16:54
Version	unspecified
OS	All
Blocks	#48661
CC	@4ast,@tstellar
Fixed by commit(s)	a260ae7 74975d3 1959ead 6d102f1 3568d61 f9efff3 2460947 6fe7c37

Extended Description

I would like to backport the following 4 commits into 12.0.1 release:
The following are 4 commits ordering from latest to earliest in llvm13 trunk:
. 6d102f1 BPF: Add LLVMTransformUtils in CMakefile LINK_COMPONENTS
. 1959ead BPF: Implement TTI.getCmpSelInstrCost() properly
. 74975d3 BPF: Add LLVMAnalysis in CMakefile LINK_COMPONENTS
. a260ae7 BPF: Implement TTI.IntImmCost() properly

These 4 patches enabled llvm generating more verifier friendly code for BPF backend and reduced user's pain to tweak their applications in order to satisfy verifier.

[4ast]

Approved. The fixes are necessary.

[tstellar]

Merged: 6fe7c37