"to make the add's lexically identical" -> "to make the adds lexically
identical"

Rollforward of #69032, which was reverted in
[63d19cf](https://github.com/llvm/llvm-project/commit/63d19cfd853b0b4e374f40842ee388b0da5de36f).

New: implemented changes in
https://github.com/llvm/llvm-project/pull/69032#issuecomment-1809250162.
Given the PassBuilder is how we expect users to register passes, the
tutorial should reflect that.

This reverts commit 7b94744e77aaf752abc2c6ab38ee3fdfafbeff9d.

This breaks the expensive checks bot: https://green.lab.llvm.org/green/job/clang-stage1-cmake-RA-expensive/26026/

We didn't notice because it was broken for other reasons I think.

Using the new pass manager is more verbose; let me know if the tutorial
doesn't flow well with all the additions.

The partial move from JITTargetAddress to ExecutorAddr in 8b1771bd9f30 did not
update the ORC or Kaleidoscope documents. This patch fixes the inconsistency.

Reviewed By: lhames

Differential Revision: https://reviews.llvm.org/D150458

There were quite a few places in the tutorial where the snippets were not up to date with the full code listings given. I have updated all of the ones I could find, which mostly involves changing `.` to `->` when accessing through a `std::unique_ptr`, changing `while (1)` to `while (true)`, and other such small changes.

There are still however a few places where I am not sure what to do, such as:
- Chapter 4: `ParseTopLevelExpr()` in chapter 3 sets the ProtoTypeAST
             name to "", however it is referred to as "__anon_expr"
             in chapter 4. Would it be required to mention this change
             in chapter 4?
- Chapter 9: The code snippets refer to the top level expression as
             "main", however the full code listing refers to it as
             "__anon_expr". I think given the context of the chapter
             it makes sense to refer to it as "main", so I have
             updated the code listing to reflect that.
- Chapter 9: In chapter 9 the diff given for `HandleTopLevelExpression()`
             deletes code that is not mentioned anywhere else, so I am
             not sure what is to be done there.
- Miscellaneous: I don't think this is very important, however the
                 casing used for the first word of error messages
                 tends to vary between upper and lower case between
                 chapters and I do not know if it is worth reconciling
                 these differences.

Reviewed By: xgupta

Differential Revision: https://reviews.llvm.org/D142323

**Motivation: **  I have been studying LLVM with LLVM Kaleidoscope tutorial. In the 4th part I faced an error which said that I can't redefine a function as shown in the tutorial. After hours of searching, I finally found the reason that produced the error is that the feature of symbols redefinition has been disabled since LLVM-9. There was no information about that in the tutorial's text, so I've decided to add a warning.

**Changes**: The only file I fixed is "`llvm/docs/tutorial/MyFirstLanguageFrontend/LangImpl04.rst`", I added text warning which says that described feature is outdated and the described functionality will not work properly on LLVM versions older 8 one.

Patch by : DKay7

Differential Revision: https://reviews.llvm.org/D130613

Reported on IRC, the tutorial code at the bottom of the page correctly
namespaces the FunctionPassManager, but the as-you-go code does not.
This patch adds the namespace to those.