[WebAssemblyLowerEmscriptenEHSjLj] Avoid lifetime of phi (#150932)

After #149310 lifetime intrinsics require an alloca argument, an
invariant that this pass can break.

I've fixed this in two ways:
* First, move static allocas into the entry block. Currently, the way
the pass splits the entry block makes all allocas dynamic, which I
assume was not actually intended. This will avoid unnecessary SSA
reconstruction for allocas as well, and thus avoid the problem.
* If this fails (for dynamic allocas) drop all lifetime intrinsics if
any one of them would require a rewrite during SSA reconstruction.

Fixes https://github.com/llvm/llvm-project/issues/150498.

0 files changed, 0 insertions, 0 deletions