Gtneg mul divoptimizations (#45604)

Gtneg mul divoptimizations (#45604)

* GT_NEG optimization for multiplication and division

* Distribute negation over parenthetical multiplication or division.

* Removing duplicate logic that I had put in accidently.

* Check overflow and other conditions before performing morph

* Resolved merge conflict and cleanup morph.cpp

* Formatting morph.cpp

* Returning tree after performing smpop again to fix flags

* Formatting

* Added check for optimizations, formatting.

* Using gtIsActiveCSE_Candidate instead of fgGlobalMorph

* Update src/coreclr/jit/morph.cpp

Co-authored-by: Sergey Andreenko <seandree@microsoft.com>
* Formatting

* delete formatting changes.

* Add a test.

* Change the conditions a bit.

* Better names for the tests.

Co-authored-by: Sergey Andreenko <seandree@microsoft.com>