Modifying the "StgHeader" struct

[Adithya Kumar]

Hello,

I want to add a field for collecting information about the number of GCs a
particular heap object survived.

I've done the following to implement this:
- Add a field "StgWord gc_id" to struct "StgHeader" and "StgThunkHeader"
- Update "SET_HDR" macro in "ClosureMacros.h" to update the "gc_id"
- Update the "closureTypeHeaderSize" function in "Heap/ClosureTypes.hs" to
  account for that 1 extra word.

Compilation leads to a segmentation fault. The stage 2 compiler is built.
But
usage of it leads to a segmentation fault.

Build output:
```
chmod +x
inplace/bin/ghc-stage2
"inplace/bin/ghc-stage2" -hisuf dyn_hi -osuf  dyn_o -hcsuf dyn_hc -fPIC
-dynamic  -O0 -H64m -Wall      -hide-all-packages -package-env - -i
-iutils/check-api-annotations/.
-iutils/check-api-annotations/dist-install/build
-Iutils/check-api-annotations/dist-install/build
-iutils/check-api-annotations/dist-install/build/check-api-annotations/autogen
-Iutils/check-api-annotations/dist-install/build/check-api-annotations/autogen
    -optP-include
-optPutils/check-api-annotations/dist-install/build/check-api-annotations/autogen/cabal_macros.h
-package-id Cabal-3.2.1.0 -package-id base-4.14.3.0 -package-id
containers-0.6.5.1 -package-id directory-1.3.6.0 -package-id
ghc-8.10.7.20240224 -Wall -XHaskell2010  -no-user-package-db -rtsopts
-Wnoncanonical-monad-instances  -outputdir
utils/check-api-annotations/dist-install/build   -c
utils/check-api-annotations/./Main.hs -o
utils/check-api-annotations/dist-install/build/Main.dyn_o
utils/check-api-annotations/ghc.mk:18: recipe for target
'utils/check-api-annotations/dist-install/build/Main.dyn_o' failed
make[1]: *** [utils/check-api-annotations/dist-install/build/Main.dyn_o]
Segmentation fault (core dumped)
Makefile:123: recipe for target 'all' failed
make: *** [all] Error 2
```

Is there any other place I've missed follow-up modifications?

I appreciate any help provided.

Best,
Adithya
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