[cfe-commits] TableGen: Goodbye RTTI!

[Sean Silva]

This patch set removes the last traces of RTTI from TableGen (both in
LLVM and Clang) and removes the crutch for enabling RTTI when building
it.

Every step of the way the generated .inc file are identical and the
TableGen tests pass. I would appreciate if someone familiar with the
build system double-checked patches 0006 and 0007 where I remove
support from the corresponding Makefile and CMakeLists.txt for RTTI;
it looked pretty obvious, but just in case there is something I don't
understand about the build system.

Patches 0001-0004 and 0007 are for LLVM. Patches 0005,0006 are for Clang.

Patch descriptions:

0001-tblgen-Put-dyn_cast-machinery-in-place-for-Init-hier.patch
This patch sets up the Init hierarchy for LLVM-style RTTI.

0002-tblgen-Mechanically-move-dynamic_cast-to-dyn_cast.patch
0003-tblgen-Use-semantically-correct-RTTI-functions.patch
These two patches migrate LLVM's TableGen code to use LLVM-style RTTI.

0004-tblgen-Move-mini-Type-hierarchy-to-LLVM-style-RTTI.patch
I found this mini Type hierarchy inside TableGen which uses RTTI.
Since it is so small, move it to use LLVM-style RTTI in one fell
swoop.

0005-tblgen-Use-LLVM-style-RTTI-in-clang-tblgen.patch
Move to LLVM-style RTTI in Clang's TableGen.

0006-tblgen-Build-clang-tblgen-without-RTTI.patch
Remove build support for RTTI in Clang's TableGen.

0007-tblgen-Compile-TableGen-without-RTTI.patch
Remove build support for RTTI in LLVM's TableGen

Feedback and review welcome.

-- Sean Silva
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