In Shell tests, replace use of the `p` alias with the `expression` command.
To avoid conflating tests of the alias with tests of the expression command,
this patch canonicalizes to the use `expression`.
See also D141539 which made the same change to API tests.
Differential Revision: https://reviews.llvm.org/D146230
This creates inline functions decls in the TUs where the funcitons are inlined and local variable decls inside those functions.
Reviewed By: labath
Differential Revision: https://reviews.llvm.org/D121967