[LLVM] Update LTO maintainer (llvm#120575)

Update the LTO maintainer from pcc to teresajohnson.

llvm/Maintainers.md

@@ -320,16 +320,11 @@ echristo@gmail.com (email), [echristo](https://github.com/echristo) (GitHub)
 Benjamin Kramer \
 benny.kra@gmail.com (email), [d0k](https://github.com/d0k) (GitHub)
 
-#### IR Linker
+#### IR Linker and LTO
 
 Teresa Johnson \
 tejohnson@google.com (email), [teresajohnson](https://github.com/teresajohnson) (GitHub)
 
-#### LTO
-
-Peter Collingbourne \
-peter@pcc.me.uk (email), [pcc](https://github.com/pcc) (GitHub)
-
 #### MCJIT, Orc, RuntimeDyld, PerfJITEvents
 
 Lang Hames \
@@ -456,6 +451,7 @@ sabre@nondot.org (email), [lattner](https://github.com/lattner) (GitHub), clattn
 Paul C. Anagnostopoulos (paul@windfall.com, [Paul-C-Anagnostopoulos](https://github.com/Paul-C-Anagnostopoulos)) -- TableGen \
 Justin Bogner (mail@justinbogner.com, [bogner](https://github.com/bogner)) -- SelectionDAG \
 Chandler Carruth (chandlerc@gmail.com, chandlerc@google.com, [chandlerc](https://github.com/chandlerc)) -- ADT, Support \
+Peter Collingbourne (peter@pcc.me.uk, [pcc](https://github.com/pcc)) -- LTO \
 Evan Cheng (evan.cheng@apple.com) -- Parts of code generator not covered by someone else \
 Jake Ehrlich (jakehehrlich@google.com, [jakehehrlich](https://github.com/jakehehrlich)) -- llvm-objcopy and ObjCopy library \
 Renato Golin (rengolin@systemcall.eu, [rengolin](https://github.com/rengolin)) -- ARM backend \