[LLVM] Update AliasAnalysis maintainers (#120447)

Currently hfinkel is listed as the AliasAnalysis maintainer, but I
believe he hasn't been actively working on LLVM in the last couple of
years, so I'd like to update this information.

I'd like to nominate fhahn and myself as the new maintainers for AA.
While here, I'd also like to nominate alinas as the maintainer for
MemorySSA.

Author: nikic

llvm/Maintainers.md

@@ -23,8 +23,10 @@ [email protected], [email protected] (email), [nikic](https://github.com/nikic) (G
 
 #### AliasAnalysis
 
-Hal Finkel \
-[email protected] (email), [hfinkel](https://github.com/hfinkel) (GitHub)
+Nikita Popov \
+[email protected], [email protected] (email), [nikic](https://github.com/nikic) (GitHub), nikic (Discourse) \
+Florian Hahn \
+[email protected] (email), [fhahn](https://github.com/fhahn) (GitHub)
 
 #### Attributor, OpenMPOpt
 
@@ -73,6 +75,11 @@ [email protected] (email), [qcolombet](https://github.com/qcolombet) (G
 Florian Hahn \
 [email protected] (email), [fhahn](https://github.com/fhahn) (GitHub)
 
+#### MemorySSA
+
+Alina Sbirlea \
+[email protected] (email), [alinas](https://github.com/alinas) (GitHub)
+
 #### SandboxVectorizer
 
 Vasileios Porpodas \
@@ -456,6 +463,7 @@ Chandler Carruth ([email protected], [email protected], [chandlerc](https:/
 Peter Collingbourne ([email protected], [pcc](https://github.com/pcc)) -- LTO \
 Evan Cheng ([email protected]) -- Parts of code generator not covered by someone else \
 Jake Ehrlich ([email protected], [jakehehrlich](https://github.com/jakehehrlich)) -- llvm-objcopy and ObjCopy library \
+Hal Finkel ([email protected], [hfinkel](https://github.com/hfinkel) -- AliasAnalysis \
 Renato Golin ([email protected], [rengolin](https://github.com/rengolin)) -- ARM backend \
 Venkatraman Govindaraju ([email protected], [vegovin](https://github.com/vegovin) -- Sparc backend \
 James Grosbach ([email protected]) -- MC layer \