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

Author: a74nh

src/coreclr/jit/codegen.h

@@ -1050,7 +1050,9 @@ XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
     void genCkfinite(GenTree* treeNode);
     void genCodeForCompare(GenTreeOp* tree);
 #ifdef TARGET_ARM64
-    void genCodeForConditional(GenTreeConditional* tree);
+    void genCodeForConditionalCompare(GenTreeOp* tree, GenCondition prevCond);
+    void genCodeForContainedCompareChain(GenTree* tree, bool* inchain, GenCondition* prevCond);
+    void genCodeForSelect(GenTreeConditional* tree);
 #endif
     void genIntrinsic(GenTree* treeNode);
     void genPutArgStk(GenTreePutArgStk* treeNode);
@@ -1715,9 +1717,8 @@ XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
 #endif // TARGET_XARCH
 
 #ifdef TARGET_ARM64
-    static insCond InsCondForCompareOp(GenTree* tree);
-    static insCond InvertInsCond(insCond cond);
-    static insCflags InsCflagsForCcmp(insCond cond);
+    static insCflags InsCflagsForCcmp(GenCondition cond);
+    static insCond JumpKindToInsCond(emitJumpKind condition);
 #endif
 
 #ifndef TARGET_LOONGARCH64