[clang] [NFC][analyzer] Refactor Environment to map Expr to SVal instead of Stmt to SVal (PR #193295)

[Donát Nagy via cfe-commits]

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@@ -792,22 +792,18 @@ inline SVal ProgramState::getLValue(QualType ElementType, SVal Idx, SVal Base) c
   return UnknownVal();
 }
 
-inline SVal ProgramState::getSVal(const Stmt *Ex,
+inline SVal ProgramState::getSVal(const Expr *Ex,
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NagyDonat wrote:

Personally feel that `E` and `Ex` are equally valid names, and in fact I very slightly prefer `Ex`, so I support that this change introduces `Ex` in the new places. However, I can also accept switching to `E` if you prefer that.

https://github.com/llvm/llvm-project/pull/193295