Add lowering support for conditional nodes (#71705)

Add lowering support for conditional nodes (#71705)

* Add lowering support for conditional nodes

* Contain conditionals

* Fix formatting

* Use AND and CMP nodes

* Fix formatting

* Remove LowerNodeCC changes

Change-Id: Icdf1828905c4a3f210b06e047ef3c0ac913d71f7
CustomizedGitHooks: yes

* Remove asserts & fix variable names

* Better contain checks for conditional compares

* Simpler contained conditions codegen

* Remove Conditional Compare nodes

* Minor cleanups

* Generate AND compare chains

* Fix unsigned compares && reduce chain check recursion

* Add compare chain tests

* Review fixes

* Use GenCondition

* Change CompareChainSize to IsValidCompareChain

* Move lowering functions to lowerarmarch

* Formatting fixes

* Fix SELECT issues

* Fix test output messages.

* Better explanations for AND chains

* Compare chains should not contain tst compares

Change-Id: I8a1761e1e89f589e1daf0318e120aae5dd3d7241
CustomizedGitHooks: yes

* Don't allow tst compares in codegeneration of compare chains

* Add tests for chains with tst compares

* Don't allow tst compares in lsrabuild of compare chains